Overland Storage Snapshot SnapSAN User Manual
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Overland Storage Snapshot SnapSAN User Manual

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SnapSAN
Overland
Storage
February 2013
10400422-002
™
Snapshot
User Guide
S3000/S5000

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Summary of Contents for Overland Storage Snapshot SnapSAN

  • Page 1 ™ SnapSAN Snapshot Overland Storage User Guide S3000/S5000 February 2013 10400422-002...
  • Page 2 Overland Storage. Overland Storage provides this manual as is, without warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. Overland Storage may make improvements or changes in the product(s) or programs described in this manual at any time.
  • Page 3 Storage Area Network (SAN), and Redundant Array of Independent Disks (RAID) technology. Product Documentation and Firmware Updates Overland Storage SnapSAN product documentation and additional literature are available online, along with the latest release of the SnapSAN Snapshot S3000/S5000 software. Point your browser to: http://docs.overlandstorage.com/snapsan...
  • Page 4 Information contained in this guide has been reviewed for accuracy, but not for product warranty because of the various environments, operating systems, or settings involved. Information and specifications may change without notice. 10400422-002 2/2013  PR-iv 2013 Overland Storage, Inc.

  • Page 5: Table Of Contents

    Collecting Information of Error of Unknown Cause ................4-22 Operations when the Configuration is Changed ................4-23 Updating Volume List ........................... 4-23 Chapter 5 - SnapSAN Manager SnapSAN Manager Main Window ........................ 5-2 10400422-002 02/2013  2013 Overland Storage, Inc.
  • Page 6 Start of Sever Connected to SV (LV) ......................A-7 Management and Operations of Snapshot ..................A-7 Linking with Replication Function ......................A-10 Appendix B - Licenses Apache License ..............................B-1 Flex License ................................B-1 OpenSSL License ..............................B-1 10400422-002 02/2013  2013 Overland Storage, Inc.
  • Page 7 SnapSAN Snapshot S3000/S5000 User Guide Index 10400422-002 02/2013  2013 Overland Storage, Inc.

  • Page 8: Chapter 1 - Overview

    • It is a virtual volume holding only the differential data block with a copy-source volume. • It shares the data block other than the difference with a copy-source volume. Therefore, the snapshot is affected differently depending on the fault type. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 9: Logical And Physical Fault

    When you back up data during normal operation, you need to stop operation only while you create a replication volume from a business volume. Therefore, you can reduce operation down time significantly. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 10: Backup Operation Using Snapshots Of Multiple Generations

    At occurrence of physical fault, such as disk fault, data is restored from a backup medium. At occurrence of logical fault, such as operation error or application fault, data is restored from the latest snapshot directly. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 11: Secondary Use In Test Operation Or Search Operation

    If you bind search operation, you can retain data of past specific days or specific time for multiple generations. Since only the differential information of the created snapshot data is retained in storage, information on multiple generations can be maintained at low cost. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 12: System Configuration

    3. Circulation usage of multiple generations: SV#2 SV#3 SV#4 ... SV#2 ...) 4. Resume the actual operation. 5. Link the SV of the necessary generation to LV, and mount the LV to a server for search operation. System Configuration The system configuration of snapshot: 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 13: Software Configuration

    SnapSAN Manager software that enables you to monitor basic states of the disk array. • AccessControl Provides the function to set the logical disks that can be accessed for each application server. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 14 SnapSAN S3000/S5000 Snapshot User Guide Backup Operation • Snapshots Provides the function to implement snapshot. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 15: Chapter 2 - Installation

    Installation tasks are outlined below. For details on each task, refer to the associated sections. Works followed by "(*)" mark are necessary for all servers installing SnapControl (including standby servers in cluster configuration). Figure 2-1: Installation Task 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 16: System Configuration

    Access Control. Software Configuration Select software to be used according to the hardware components, operating conditions, etc. is shown in software configuration example. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 17: Software Installation

    Snapshot Management (GUI) The snapshot management (GUI) is included in the SnapSAN Manager. For details on the operating environment, refer to the installation guide attached to the SnapSAN Manager. Installation SnapSAN Manager Server Installation 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 18: Snapcontrol

    For details on the memory capacity required to install this software, refer to the installation guide attached to this software. Installation For details on the installation procedure, refer to the installation guide attached to this software. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 19: Disk Array Configuration

    • Save all SVs that were set in the same BV in the same pool. • Save a control volume (CV) either in the basic pool or the dynamic pool. Then, bind a volume used for operations and a control volume used for operations. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 20: Settings Of Disk Array Name, Logical Disk Name, And Port Name

    • After creation of the generation, you cannot change the OS types of BV and SV/LV. These settings are performed from an SnapSAN Manager client. For details on the operation procedure, refer to the "User's Manual (UNIX)". 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 21 Access Control is necessary for a system in which the snapshot function is installed. Before performing the following operations, enable Access Control setting. In addition, Access Control setting needs to be performed for volumes that have already been used for other operations. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 22 After setting Access Control, restart the system so that each server can recognize the volume. Setting for Access Controls requires purchasing the AccessControl. For details on the setting procedures, refer to the "Configuration Setting Tool User's Manual (GUI)". 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 23: Disk Arrays Identifying The Control Volume Attribute

    Select and describe one logical disk for each disk array. If you describe multiple logical disks in the same disk array, the information on the first one becomes valid and the information on the second and subsequent ones is ignored. [File location and file name] /etc/iSMrpl/ctlvol.conf 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 24 • The path between the disk array and the server is normally connected. • The logical disk in the disk array is recognized as a server (OS) disk device. • The volume in the disk is recognized by the server (OS). 10400422-002 02/2013  2-10 ©2013 Overland Storage, Inc.

  • Page 25: Lvm Configuration

    Bind the volume group and logical volume on the application server. If they are already bound, this task is not necessary. For details on how to bind the LVM, refer to the relevant manuals. 10400422-002 02/2013  2-11 ©2013 Overland Storage, Inc.
  • Page 26 Figure 2-6: LVM Disk Generation Creation and Replication Saving the BV Volume Group Setting Information Save the BV volume group setting information. vgcfgbackup /dev/vg01 10400422-002 02/2013  2-12 ©2013 Overland Storage, Inc.
  • Page 27 Check that a snapshot generation and link-volume have been created for BV. When creating a generation, you must specify SVs disk so that they have one-to-one correspondence with logical disks making up the disk group. 10400422-002 02/2013  2-13 ©2013 Overland Storage, Inc.
  • Page 28 Release a link to SV set In this example, assume that a link set from link-volume lv001 to logical disk name sv001_1 is released. iSMsc_unlink -lv lv001 -lvflg ld -sv sv001_1 -svflg ld 10400422-002 02/2013  2-14 ©2013 Overland Storage, Inc.
  • Page 29 In this example, "ext3" is used as a file system in an environment that has Path Manager installed. mkfs -t ext3 /dev/dda Creating a generation (application server) Check that a snapshot generation and link-volume have been created for BV. Figure 2-9: Without Volume Management 10400422-002 02/2013  2-15 ©2013 Overland Storage, Inc.

  • Page 30: Chapter 3 - Function

    LV that a server can access can be linked with a different SV. This enables access to any snapshot. A list of BV or SV volumes (link permit volume) that LV can access is referred to as a link control list (LCL). 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 31 This function is used for guarding a snapshot image created in SV. Setting a guard classification to a specific snapshot enables you to guard the necessary snapshot data. Figure 3-2: Snapshot Function and Operation 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 32 This function is used for unlinking LV with the linked BV or SV. Figure 3-3: Link Volume Function and Operation SV States and State Transition Relationship Between Each Snapshot Operation and SV State Transition 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 33 ·SV cannot be used to create a snapshot. ·It is necessary to rebind the SV where a preparation fault occurred (rebind it by performing “generation unbind” and “generation adding” using the SnapSAN Manager client configuration setting function). 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 34 SV of which generation attribute is once "Derived", the attribute is returned to "Normal". Derived SV Generation Number at Restoration There are two operation modes for restoration of the snapshot function. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 35 At this time, -1, -2, -3, ... is given to the generation number in the creation time order from the latest snapshot. All created snapshots including snapshots with the derived generation and normal generation are subjects. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 36 • SV guard is set for SV#1 after snapshot creation. • Since guard is set for SV#1, snapshots are created cyclically from SV#2 to SV#4 at t5 and afterward. • "tn" in the following table indicates a generation number (creation time). 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 37 2. If FAT16 or FAT32 is used for the file system, use the mount command of disk management operation commands or start [Disk Management] of Windows and link it to the file system. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 38 • An SRA shares and retains differential data of multiple SVs. • An SRA can be bound only in a dynamic pool. • An SRA can be extended without operation down time when space is running short. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 39 SV will be lost. Events that may cause the shortage of the snapshot reserve area are as follows: • Restoration in the derived generation keep mode is executed. • Data is written to BV during restoration. 10400422-002 02/2013  3-10 ©2013 Overland Storage, Inc.
  • Page 40 A snapshot can be created by command operation from a server on which SnapControl is installed or by GUI operation with iSM. Figure 3-10: Creating a Snapshot 10400422-002 02/2013  3-11 ©2013 Overland Storage, Inc.
  • Page 41 Snapshots including those of which generations are later than the restored generations are kept. A snapshot can be restored by command operation from a server on which SnapControl is installed or by GUI operation with iSM. Figure 3-11: Restoration 10400422-002 02/2013  3-12 ©2013 Overland Storage, Inc.
  • Page 42 A snapshot can be deleted by command operation from a server on which SnapControl is installed or by GUI operation with iSM. Figure 3-12: Deleting a Snapshot To delete a snapshot, the following conditions need to be satisfied. 10400422-002 02/2013  3-13 ©2013 Overland Storage, Inc.
  • Page 43 (link permit volume) that access is permitted via the LV. The created volume list is referred to as a link control list (LCL). LV is bound by the SnapSAN Manager configuration setting function. 10400422-002 02/2013  3-14 ©2013 Overland Storage, Inc.
  • Page 44 Figure 3-15: Setting a Link To set a link, the following conditions need to be satisfied. • The volume where a link is to be set is registered in the link control list in advance. 10400422-002 02/2013  3-15 ©2013 Overland Storage, Inc.
  • Page 45 The advantages of data replication are outstanding performance and reliability during use of a replication volume, because a replication volume is physically independent. Therefore, data replication suits secondary use or backup operation that needs high performance and high reliability. 10400422-002 02/2013  3-16 ©2013 Overland Storage, Inc.
  • Page 46 • It is possible to recover from a physical fault promptly by creating replication RV at long intervals using data replication (restoration from RV). • It is possible to reduce effect on a business volume by using the replicated RV for backup. 10400422-002 02/2013  3-17 ©2013 Overland Storage, Inc.
  • Page 47 It is possible to reduce cost by using the snapshot function for backup at data transfer destination. Figure 3-18: Operating Backup with Remote Replication <Data transfer to a remote site> 10400422-002 02/2013  3-18 ©2013 Overland Storage, Inc.
  • Page 48 MV and BV, or RV and BV. In this section, the configuration shown in Figure 2-20 is assumed and operations and states are listed with a matrix. 10400422-002 02/2013  3-19 ©2013 Overland Storage, Inc.
  • Page 49 Restoring a snapshot  Deleting a snapshot     Guarding a snapshot     Setting an SV link     Unlinking SV     10400422-002 02/2013  3-20 ©2013 Overland Storage, Inc.
  • Page 50 Replication Operations and Snapshot States 1 (Replication Operations of MV) State MV/BV Operation Being restored BV is being SV is being linked linked Replication   Separation   Restoration : Executable -: Unexecutable  10400422-002 02/2013  3-21 ©2013 Overland Storage, Inc.

  • Page 51: Large-Capacity Volume

    If several LVs are bound for a BV, respective LVs must be used on different servers. The above contents are applied when a BV or SDV is operated in a virtual capacity logical disk. 10400422-002 02/2013  3-22 ©2013 Overland Storage, Inc.
  • Page 52 (BV, SV, LV, and SDV (SRA)) (including unallocated volumes) allocated to the partition for which authority is not granted to the partition user. * Storage group user or partition user with the authority When the BV and LV (SV) are allocated to the same partition: 10400422-002 02/2013  3-23 ©2013 Overland Storage, Inc.
  • Page 53 FC and that used when it is iSCSI. Restrictions by the Thin Provisioning Function The thin provisioning function allocates a capacity of a disk array to a volume according to the amount of data written into the volume. 10400422-002 02/2013  3-24 ©2013 Overland Storage, Inc.
  • Page 54 It is possible to check the physical disks that make up volumes by referring to the PD type in the snapshot state screen or PD Type reports of the iSMvollist and iSMrc_ldlist commands. 10400422-002 02/2013  3-25 ©2013 Overland Storage, Inc.

  • Page 55: Chapter 4 - Operation And Maintenance

    SV (the first generation) and a backup server has been constructed and operation has started in volumes. It is assumed that the following information is given to each volume. • BV: Logical disk name (bv001), drive letter (G:) 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 56 SnapSAN S3000/S5000 Snapshot User Guide Logical Fault and Physical Fault • SV: Logical disk name (sv001_01) • LV: Logical disk name (lv001), drive letter (H:) Figure 4-1: Online Backup 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 57 Therefore, before terminating operation, delete the generation for which a snapshot is to be created. If you use a snapshot cyclically, use the following command to delete a snapshot. iSMsc_delete -bv bv001 -bvflg ld -auto 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 58 -bv bv001 -bvflg ld -sv .-1 -svflg relgen -mode set 7. Mounting BV (application server) Mount BV to use as a business volume again. iSMrc_mount -drv G: 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 59 The disk of the LV (SV) is changed to Not Ready. iSMrc_umount -mvol \\?\Volume{37d84cca-2507-11d5-a0f7-00004c714491}\ 14. Releasing a link between LV and SV (backup server) After unmounting, release a link between LV and SV. iSMsc_unlink -lv lv001 -lvflg ld 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 60: Restoring Business Volume Data

    In addition, it is assumed that the following information is given to each volume. • BV: Logical disk name (bv001), drive letter (G:) • SV: Logical disk name (sv001_01) • LV: Logical disk name (lv001), drive letter (H:) 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 61 When halting a service "ESMCommonService", specify as follows: NET STOP ESMCommonService Example: Canceling sharing of folder NET SHARE share_name /delete When canceling the sharing of the folder bv_folder1, specify as follows: NET SHARE bv_folder1 /delete 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 62 Data Restoration with Use of Snapshot Function (Physical Fault) When the BV data file or BV volume cannot be accessed due to a physical fault, BV can be recovered from a tape or another backup device. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 63 It is assumed that the following information is given to each volume. • BV: Logical disk name (bv001), drive letter (G:) • SV: Logical disk name (sv001_01) • LV: Logical disk name (lv001), drive letter (H:) Figure 4-5: Data Restoration Snapshot Function (Physical Fault) 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 64 When halting a service "ESMCommonService", specify as follows: NET STOP ESMCommonService Example: Canceling sharing of folder NET SHARE share_name /delete When canceling the sharing of the folder bv_folder1, specify as follows: NET SHARE bv_folder1 /delete 10400422-002 02/2013  4-10 ©2013 Overland Storage, Inc.
  • Page 65 When the LV (BV) is unmounted, the mount point (drive letter or NTFS folder name) set for the volume is automatically deleted. The disk of the LV (BV) is changed to Not Ready. iSMrc_umount -drv H: 10400422-002 02/2013  4-11 ©2013 Overland Storage, Inc.
  • Page 66 It is also assumed that the following information is given to each volume. • BV: Logical disk name (bv001), drive letter (G:) • SV: Logical disk name (sv001_01 to sv001_07) • LV: Logical disk name (lv001), drive letter (H:) 10400422-002 02/2013  4-12 ©2013 Overland Storage, Inc.
  • Page 67 SnapSAN S3000/S5000 Snapshot User Guide Logical Fault and Physical Fault Figure 4-7: Secondary Use Snapshots Figure 4-8: Secondary Use Snapshots Flow Operation Procedure (Application Server) An application server creates a BV snapshot regularly. 10400422-002 02/2013  4-13 ©2013 Overland Storage, Inc.
  • Page 68 When you create a snapshot, check whether the snapshot of the oldest generation is not used from a test operation. iSMsc_create -bv bv001 -bvflg ld -cyclic 5. Mounting BV (application server) Mount BV to use as a business volume again. iSMrc_mount -drv G: 10400422-002 02/2013  4-14 ©2013 Overland Storage, Inc.
  • Page 69 Unmounting LV (SV) deletes the drive letter or the NTFS folder name set to the volume automatically. iSMrc_umount -drv H: 6. Releasing a link between LV and SV (test server) After unmounting, release a link between LV and SV. iSMsc_unlink -lv lv001 -lvflg ld 10400422-002 02/2013  4-15 ©2013 Overland Storage, Inc.
  • Page 70 It may be caused by a physical fault of SDV constituting SRA or a physical fault of the pool where SRA is stored. On the main window of the SnapSAN Manager client, you can check whether a fault occurs. After a fault recovery, create SRA and the snapshot again. 10400422-002 02/2013  4-16 ©2013 Overland Storage, Inc.
  • Page 71 Take necessary actions depending on the message. The command trace is output in the etc folder under the folder where SnapControl has been installed (\Program Files\Overland Storage\iSMrpl\etc\ by default) as a text file beginning with "iSM_Log". Check the contents using a text editor.
  • Page 72 If resetting the drive letter for BV or mounting the BV in the NTFS folder fails, recovery (e.g., resetting of the drive letter or remounting of BV into the NTFS folder) is necessary for restarting operation. The following describes the recovery procedure: 10400422-002 02/2013  4-18 ©2013 Overland Storage, Inc.

  • Page 73: Illegal File System On Sv (Lv)

    • If backup server is allowed to access snapshot during unmounting operation Access to SV (LV) which is in the Not Ready state during unmounting operation is not allowed normally. Try to access to SV (LV) volume during unmounting operation from My Computer. 10400422-002 02/2013  4-19 ©2013 Overland Storage, Inc.
  • Page 74 SV (LV) is placed in the Not Ready (unavailable for read or write) state by the unset link or unmounting using the iSMrc_umount command. In this case, you must make the operating system recognize SV (LV). This section describes how to do this. 10400422-002 02/2013  4-20 ©2013 Overland Storage, Inc.
  • Page 75 1. Starting server Start the server that has been down. 2. Setting a link If a link is released, execute the following command. iSMsc_link -lv lv001 -lvflg ld -sv bv001.-1 -svflg ld.relgen 10400422-002 02/2013  4-21 ©2013 Overland Storage, Inc.

  • Page 76: Collecting Information Of Error Of Unknown Cause

    3. Confirm that the iSMvolgather directory is created under the installation directory when the storage destination directory is not changed or under the specified directory when it is changed, and obtain the files under that directory. 10400422-002 02/2013  4-22 ©2013 Overland Storage, Inc.

  • Page 77: Operations When The Configuration Is Changed

    • Register the logical disk to be used as a control volume in advance by executing the [Define Control Volume] operation in the Volume List Display screen. 10400422-002 02/2013  4-23 ©2013 Overland Storage, Inc.
  • Page 78 1. Log on as a member in the Administrator group. 2. Click the Windows [Start] button and select [ControlCommand], [Storage Manager Volume List] and [Difficulty Information Gather] from [Programs] ([All Programs] for Windows Server 2003). 10400422-002 02/2013  4-24 ©2013 Overland Storage, Inc.
  • Page 79 (OS) when the server restarts while the LV is in the Not Ready (unavailable for read or write) state. In such a case, it is required to have the OS recognize the LV again. 10400422-002 02/2013  4-25 ©2013 Overland Storage, Inc.
  • Page 80 Note that the snapshot operation command execution may abnormally end in the future operation if the information in the volume list contains an error or if the volume list information is inconsistent with the batch or other file used for operation. 10400422-002 02/2013  4-26 ©2013 Overland Storage, Inc.

  • Page 81: Chapter 5 - Snapsan Manager

    This chapter describes how to operate snapshot with SnapSAN Manager. Figure 5-1: Operating System with SnapSAN Manager Functions provided by SnapSAN Manager and shows the correspondence between these functions and the operation screens and command: 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 82: Snapsan Manager Main Window

    SnapSAN Manager main window. The SnapSAN Manager main window displays the following snapshot-related information. • Snapshot configuration information • Volume link configuration information • SRA configuration information 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 83 • SV allocation and unbinding • LV binding, unbinding, link permission setting • SRA binding, unbinding, capacity threshold setting • BV/SV, LV, and SRA configuration information display 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 84 [(ii)] on the right side of the screen that displays the information about the item selected in the configuration display area. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 85 Disk Array Layer This layer displays a list of disk arrays that are being monitored by SnapSAN Manager and that can use the snapshot functions, as well as their states. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 86 This layer displays the base-volume list and the pool list to which snapshot-volumes belong. Based on the environment setting for state monitoring, either a logical disk number or logical disk name is displayed as an identifier for each logical disk. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 87 Figure 5-7: Disk Array List The disk array list displays the information about the items described below. Double-clicking an item switches the display to the list one level below the currently displayed one. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 88 If a restore fault or snapshot fault occurred, the icon changes Represents a collection of snapshot-volumes. If the snapshot is released, the icon changes to If a snapshot fault or SV prepare fault occurred, the icon changes to 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 89 Displays the logical disk number of the base-volume in hexadecimal. BV OS Type Indicates the OS type of the base-volume. Display Description Indicates the logical disk is operating on an ACOS-2 system. Indicates the logical disk is operating on an ACOS-4 system. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 90 Displays the name of the pool to which the snapshot-volume set in the base-volume belongs. SV PD Type Displays the physical disk type configuring the pool to which the snapshot-volume set in the base-volume belongs. 10400422-002 02/2013  5-10 ©2013 Overland Storage, Inc.
  • Page 91 If the snapshot is released, the icon changes to   If a snapshot fault or SV prepare fault occurred, the icon changes to SV Number Displays the logical disk number of the snapshot-volume in hexadecimal. 10400422-002 02/2013  5-11 ©2013 Overland Storage, Inc.

  • Page 92: Pool Name

    Indicates the snapshot is being deleted. Deleting Indicates the snapshot is released. Creating a snapshot Released changes the status to active. Indicates the state that snapshot restoration was suspended. Restore suspended 10400422-002 02/2013  5-12 ©2013 Overland Storage, Inc.
  • Page 93 Displays the used snapshot capacity. This item is shown when the snapshot is active or being restored. Capacity [GB] Displays the virtual capacity of the snapshot-volume. The displayed value is equal to the capacity of the corresponding base-volume. 10400422-002 02/2013  5-13 ©2013 Overland Storage, Inc.
  • Page 94 Indicates the OS type of the destination-volume (DV). This item is shown when there is a volume link. DV Logical Disk Name Displays the logical disk name of the destination-volume (DV). This item is shown when there is a volume link. 10400422-002 02/2013  5-14 ©2013 Overland Storage, Inc.
  • Page 95 Icon Description Represents a pool. If a threshold excess occurred in pool, the icon changes to Pool Name Displays the pool name. PD Type Displays the physical disk type configuring the pool. 10400422-002 02/2013  5-15 ©2013 Overland Storage, Inc.
  • Page 96 Snapshot Used Capacity is represented in 0.1 GB units. If a threshold excess occurred in used snapshot capacity, the icon " * " appears at the left of the displayed value. Snapshot Threshold [GB] Displays the snapshot threshold. 10400422-002 02/2013  5-16 ©2013 Overland Storage, Inc.
  • Page 97 Displays the logical disk number of the base-volume in hexadecimal. BV OS Type Indicates the OS type of the base-volume. BV Logical Disk Name Displays the logical disk name of the base-volume. Status Displays the status of the snapshot. 10400422-002 02/2013  5-17 ©2013 Overland Storage, Inc.
  • Page 98 Displays the name of partition to which the base-volume belongs. This column is not displayed for disk arrays for which VirtualStoragePartitioning has not been purchased. SV Pool Number Displays the number of the pool to which the snapshot-volume set in the base-volume belongs in hexadecimal. 10400422-002 02/2013  5-18 ©2013 Overland Storage, Inc.
  • Page 99 Base-volume unit list - snapshot-volume The snapshot-volume display area of the base-volume unit list displays the information about the items described below. Double-clicking an item displays the Connection screen. Type Indicates the volume type. 10400422-002 02/2013  5-19 ©2013 Overland Storage, Inc.
  • Page 100 Restore preparing Indicates the state in which snapshot restore is in preparation. Guard Displays the snapshot guard status. Display Description Guard Indicates the snapshot is guarded. Link Displays the state of the connection with the link-volume. 10400422-002 02/2013  5-20 ©2013 Overland Storage, Inc.
  • Page 101 Displays the logical disk name of the link-volume. This item is shown when there is a volume link. LV Mode Displays the access restriction of the link-volume. This item is shown when there is a volume link. 10400422-002 02/2013  5-21 ©2013 Overland Storage, Inc.
  • Page 102 Indicates the OS type of the destination-volume (DV). This item is shown when there is a volume link. For information about the displayed type, refer to "BV OS Type" in "Base-volume list". 10400422-002 02/2013  5-22 ©2013 Overland Storage, Inc.
  • Page 103 Displays the logical disk number of the snapshot-volume in hexadecimal. SV OS Type Indicates the OS type of the snapshot-volume. For information about the displayed type, refer to "BV OS Type" in "Base-volume list". 10400422-002 02/2013  5-23 ©2013 Overland Storage, Inc.
  • Page 104 "-" is displayed for the generation number at snapshot fault. Generation Attribute Displays the generation attribute of the snapshot. This item is shown when the snapshot is active or being restored. 10400422-002 02/2013  5-24 ©2013 Overland Storage, Inc.
  • Page 105 The link-volume display area of the base-volume unit list displays the information about the items described below. Double-clicking an item displays the Connection screen. Type Indicates the volume type LV Number Displays the logical disk number of the link-volume in hexadecimal. 10400422-002 02/2013  5-25 ©2013 Overland Storage, Inc.
  • Page 106 Indicates the volume can only be read from the operating Read Only host. Indicates the volume cannot be operated from the operating Not Ready host. Indicates the volume cannot be operated from any host. Not Available 10400422-002 02/2013  5-26 ©2013 Overland Storage, Inc.
  • Page 107 Indicates the OS type of the base-volume corresponding to the snapshot-volume. BV Logical Disk Name Displays the logical disk name of the base-volume corresponding to the snapshot-volume. Status Displays the status of the snapshot. 10400422-002 02/2013  5-27 ©2013 Overland Storage, Inc.
  • Page 108 Derived Indicates a generation with the derived attribute by restoration. Used Capacity [GB] Displays the amount of snapshot capacity used. This item is shown when the snapshot is active or being restored. 10400422-002 02/2013  5-28 ©2013 Overland Storage, Inc.
  • Page 109 The execution dialogs displayed for individual snapshot operations are described below. Execution dialog for base-volume operations The following execution dialog example of the Snapshot Cyclic Creation explains the execution dialog displayed for the base-volume operations. 10400422-002 02/2013  5-29 ©2013 Overland Storage, Inc.
  • Page 110 Displays the access restriction of the base-volume. Execution dialog for snapshot-volume operations The execution dialog displayed for snapshot-volume operations allows you to switch between the summary display and the details display of the volume-related information. 10400422-002 02/2013  5-30 ©2013 Overland Storage, Inc.
  • Page 111 Displays the logical disk name of the base-volume. Creation Time Displays the creation time of the snapshot. Generation Number Displays the generation number of the snapshot. Generation Attribute Displays the generation attribute of the snapshot. 10400422-002 02/2013  5-31 ©2013 Overland Storage, Inc.
  • Page 112 Displays the logical disk number of the destination-volume (DV) in hexadecimal. DV OS Type Indicates the OS type of the destination-volume (DV). DV Logical Disk Name Displays the logical disk name of the destination-volume (DV). 10400422-002 02/2013  5-32 ©2013 Overland Storage, Inc.

  • Page 113: Configuration Display Command (Ismview)

    • Volume-link configuration information • SRA configuration information Binding a Volume When installing snapshot When installing snapshot, perform the configuration setting in accordance with the following procedure. Figure 5-20: Binding a Volume Flow 10400422-002 02/2013  5-33 ©2013 Overland Storage, Inc.
  • Page 114 When rebinding a snapshot-volume When the snapshot-related volumes need to be rebound because of a failure or for some other reasons, perform the configuration setting in accordance with the following procedure. 10400422-002 02/2013  5-34 ©2013 Overland Storage, Inc.

  • Page 115: Binding The Snapshot Reserve Area

    Figure 5-21: Snapshot Reserve Area (SRA) Binding Select a pool. Select a pool where you want to bind a snapshot reserve area. Pools that meet any of the following conditions cannot be selected. 10400422-002 02/2013  5-35 ©2013 Overland Storage, Inc.
  • Page 116 Base-volume capacity 10 GB Number of snapshot generations 4 SRA capacity10 (GB) 30 (%) 4 (generations) = 12 GB • The snapshot reserve area can be expanded after binding (free pool space is required). Confirmation 10400422-002 02/2013  5-36 ©2013 Overland Storage, Inc.
  • Page 117 [Back] button: Returns to the Snapshot Reserve Area Bind screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. 10400422-002 02/2013  5-37 ©2013 Overland Storage, Inc.
  • Page 118 No OS Type can be specified for the snapshot data volume. In that case, the field is blank. The logical disk name can be changed later by selecting the [Logical Disk]-[Logical Disk Management]-[Change Settings]. 10400422-002 02/2013  5-38 ©2013 Overland Storage, Inc.
  • Page 119 The value of the snapshot reserve area capacity is a certain percentage of the target base- volume multiplied by the number of generations. Example: When assuming 30% Base-volume capacity10 GB Number of snapshot generations4 SRA capacity10 (GB) x 30 (%) x 4 (generations) = 12 GB 10400422-002 02/2013  5-39 ©2013 Overland Storage, Inc.
  • Page 120 Base-Volume (BV). Logical disks that meet any of the following conditions are not displayed in the volume list. • The snapshot type is SV, LV, SDV, or SV*. • CV (Control Volume) 10400422-002 02/2013  5-40 ©2013 Overland Storage, Inc.
  • Page 121 About the addition of snapshot generations • Up to 16 snapshot generations can be added per logical disk. • Snapshot generations can be added to more than one logical disk (up to 64 logical disks) simultaneously. 10400422-002 02/2013  5-41 ©2013 Overland Storage, Inc.
  • Page 122 [Back] button: Returns to the Generation Addition screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. 10400422-002 02/2013  5-42 ©2013 Overland Storage, Inc.
  • Page 123 • If the attempt to name the logical disk at the time of binding fails, a 20-character-long logical disk name is set that consists of the disk array-specific 16-character string followed by a four-digit hexadecimal logical disk number. 10400422-002 02/2013  5-43 ©2013 Overland Storage, Inc.

  • Page 124: Binding A Link-Volume

    Source volumes to bind link-volumes are selected. Confirmation Link-volumes to bind are displayed. Check whether the settings are correct. [Advanced]: Click this button to make detailed link-volume settings. Completion The link-volume binding result is displayed. 10400422-002 02/2013  5-44 ©2013 Overland Storage, Inc.
  • Page 125 Confirmation Figure 5-32: Link Volume Confirmation This screen is to confirm the settings to bind a snapshot reserve area. Check whether the displayed settings to bind a snapshot reserve area are correct. 10400422-002 02/2013  5-45 ©2013 Overland Storage, Inc.
  • Page 126 Specify the threshold for the snapshot reserve area, as follows. • Ratio Specify the threshold as the ratio to the snapshot reserve area capacity. • Capacity Specify the threshold as the capacity of the snapshot reserve area. 10400422-002 02/2013  5-46 ©2013 Overland Storage, Inc.
  • Page 127 * All characters must be 1 byte in size. Completion Figure 5-35: Reserve Area Binding Success The snapshot reserve area binding result is displayed. When the processing succeeded, the following link is displayed. 10400422-002 02/2013  5-47 ©2013 Overland Storage, Inc.
  • Page 128 Snapshot data volumes to bind are displayed. Check whether the settings are correct. [Advanced]: Click this button to make detailed snapshot volume settings. Completion The generation addition result is displayed. Generation Addition Figure 5-36: Adding Snapshot Generation Wizard 10400422-002 02/2013  5-48 ©2013 Overland Storage, Inc.
  • Page 129 Specify the number of additional generation tone logical disk. Specify the number of snapshot generations. Up to 16 snapshot generations can be added to a logical disk. [Next] button: Proceeds to the Confirmation screen. 10400422-002 02/2013  5-49 ©2013 Overland Storage, Inc.
  • Page 130 This screen is to confirm the generation addition. Check whether the displayed settings about snapshot volumes to bind are correct. [Advanced] button: Opens the advanced settings screen. [Set] button: Displays the following confirmation dialog box. 10400422-002 02/2013  5-50 ©2013 Overland Storage, Inc.
  • Page 131 • Specify a disk name based on the BV name in the following format: logical-disk-name-to-which-generations-are-added_SV-logical-disk-number When the specified disk name exceeds 16 characters, the dialog box to select the portion to be used is displayed. 10400422-002 02/2013  5-51 ©2013 Overland Storage, Inc.
  • Page 132 The snapshot addition result is displayed. When the processing succeeded, the following links are displayed. • Add another generations Opens the Generation Addition screen to add other snapshot generations. • Bind link-volume Opens the Link-volume Bind screen. 10400422-002 02/2013  5-52 ©2013 Overland Storage, Inc.
  • Page 133 Select base-volumes in which link-volumes is bind. Multiple base-volumes can be selected. Base-volumes that meet the following conditions cannot be selected. Locked A base-volume on which configuration setting operation guard is set. [Next] button: Proceeds to the Confirmation screen. 10400422-002 02/2013  5-53 ©2013 Overland Storage, Inc.
  • Page 134 [Back] button: Returns to the Link-volume Bind screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. 10400422-002 02/2013  5-54 ©2013 Overland Storage, Inc.
  • Page 135 If the attempt to name the logical disk at the time of binding fails, a 20-character-long logical disk name is set that consists of the disk array-specific 16-character string followed by a four-digit hexadecimal logical disk number. Completion 10400422-002 02/2013  5-55 ©2013 Overland Storage, Inc.
  • Page 136 Confirmation Snapshot data volumes to unbind are displayed. Check whether the settings are correct. • [Advanced]: Click this button to make detailed snapshot reserve area settings. Completion The expansion result is displayed. 10400422-002 02/2013  5-56 ©2013 Overland Storage, Inc.
  • Page 137 Disk array: 1024 (up to 1024 per node) Pool: 1024 If the configuration change of one of snapshot data volumes (SDV) configuring a snapshot reserve area is locked, the area cannot be expanded. 10400422-002 02/2013  5-57 ©2013 Overland Storage, Inc.
  • Page 138 [Back] button: Returns to the Snapshot Reserve Area Expansion screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. 10400422-002 02/2013  5-58 ©2013 Overland Storage, Inc.
  • Page 139 • Ratio: Specify the threshold as the ratio to the snapshot reserve area capacity. • Capacity: Specify the threshold as the capacity of the snapshot reserve area. When the snapshot usage exceeds the specified threshold, a warning is issued to SnapSAN Manager. 10400422-002 02/2013  5-59 ©2013 Overland Storage, Inc.
  • Page 140 [Finish] button: Returns to the monitoring screen. Changing the Snapshot Threshold The work of expanding the snapshot reserve area is done using the Reserve Area Change screen in the wizard format as follows. 10400422-002 02/2013  5-60 ©2013 Overland Storage, Inc.
  • Page 141 • Capacity: Specify the threshold as the capacity of the snapshot reserve area. [Set] button: Displays the following confirmation dialog box. Figure 5-52: Confirmation Dialog Box Clicking [Yes] starts changing the snapshot reserve area settings. 10400422-002 02/2013  5-61 ©2013 Overland Storage, Inc.
  • Page 142 Pools that meet any of the following conditions cannot be selected. no unbindable SV There is no snapshot-volume that can be unbound. locked Configuration change is locked. Select deletion generation. Specify the number of generations to be unbound. 10400422-002 02/2013  5-62 ©2013 Overland Storage, Inc.
  • Page 143 [Back] button: Returns to the Generation Deletion screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. 10400422-002 02/2013  5-63 ©2013 Overland Storage, Inc.

  • Page 144: Unbinding Snapshot-Related Volumes

    LV: Link-volume Link-volume can be unbound using the Link-volume Unbind screen described in this section. SV*: Snapshot-volume that failed to be bound These volumes can be unbound using the LD Unbind screen. 10400422-002 02/2013  5-64 ©2013 Overland Storage, Inc.
  • Page 145 [Next] button: Proceeds to the Confirmation screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. 10400422-002 02/2013  5-65 ©2013 Overland Storage, Inc.
  • Page 146 [Back] button: Returns to the Link-volume Unbind screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. 10400422-002 02/2013  5-66 ©2013 Overland Storage, Inc.
  • Page 147 Eliminate these states before unbinding the logical disk Unbinding the Snapshot Reserve Area The work of unbinding the snapshot reserve area is done using the Snapshot Reserve Area Unbind screen in the wizard format as follows. 10400422-002 02/2013  5-67 ©2013 Overland Storage, Inc.
  • Page 148 [Next] button: Proceeds to the Confirmation screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. Confirmation 10400422-002 02/2013  5-68 ©2013 Overland Storage, Inc.
  • Page 149 [Back] button: Returns to the Snapshot Reserve Area Unbind screen. [Cancel] button: Displays a dialog box confirming your intention to quit the wizard. When clicking the [OK] button on the dialog box, the wizard ends. 10400422-002 02/2013  5-69 ©2013 Overland Storage, Inc.

  • Page 150: Snapshot Operation

    Create a base-volume snapshot cyclically in a snapshot-volume. The created snapshot can be used by connecting a link-volume to the snapshot-volume. Display the Snapshot Cyclic Creation screen using one of the following procedures. 10400422-002 02/2013  5-70 ©2013 Overland Storage, Inc.
  • Page 151 Impossible SV link-volume, and then retry. Retry after snapshot deletion is completed. Snapshot Deleting Retry after restarting the monitoring of the disk array. Monitoring Suspended 10400422-002 02/2013  5-71 ©2013 Overland Storage, Inc.
  • Page 152 Snapshot Management screen for other operations. You can also check the object snapshot state of the selected base volume from the information list display area of the Snapshot Management screen. Figure 5-68: Cancellation Message Dialog 10400422-002 02/2013  5-72 ©2013 Overland Storage, Inc.
  • Page 153 However, unmounting is unnecessary when the static point is ensured by hot backup (online backup) etc. The snapshot cyclic creation operation also creates a new snapshot for a snapshot-volume that already has a snapshot. In this case, the existing snapshot is deleted. 10400422-002 02/2013  5-73 ©2013 Overland Storage, Inc.
  • Page 154 If "Unexecutable" is shown in the [Execution Result] field, the volume does not meet the execution conditions and therefore cannot be selected. If there is any unexecutable volume, refer to the [Unexecutable Information] and take one of the following actions. 10400422-002 02/2013  5-74 ©2013 Overland Storage, Inc.
  • Page 155 Access mode of a base-volume is changed to R/W Permit by the base-volume access mode change operation. This operation is normally unnecessary. Execute, however, only when access mode of a base-volume cannot be returned to R/W Permit from the host. 10400422-002 02/2013  5-75 ©2013 Overland Storage, Inc.
  • Page 156 If "Unexecutable" is shown in the [Execution Result] field, the volume does not meet the execution conditions and therefore cannot be selected. If there is any unexecutable volume, refer to the [Unexecutable Information] and take one of the following actions. 10400422-002 02/2013  5-76 ©2013 Overland Storage, Inc.
  • Page 157 BV Data Being Migrated Summary/Details Clicking the [Execute] button displays the following confirmation dialog Figure 5-74: Creation Confirmation Clicking the [Yes] button displays the following dialog indicating the system is during processing. 10400422-002 02/2013  5-77 ©2013 Overland Storage, Inc.
  • Page 158 Figure 5-77: Deletion If you select [No] in this dialog, the following confirmation dialog is displayed asking if you want to continue with the processing of the remaining snapshot-volumes that are selected. 10400422-002 02/2013  5-78 ©2013 Overland Storage, Inc.
  • Page 159 Clicking the [Cancel] button from the Processing dialog suspends cyclic snapshot creation and redisplays the Snapshot Management screen. If snapshot deletion is performed but snapshot creation is not performed, the target snapshot state becomes invalid. 10400422-002 02/2013  5-79 ©2013 Overland Storage, Inc.
  • Page 160 If "Unexecutable" is shown in the [Execution Result] field, the volume does not meet the execution conditions and therefore cannot be selected. If there is any unexecutable volume, refer to the [Unexecutable Information] and take one of the following actions. 10400422-002 02/2013  5-80 ©2013 Overland Storage, Inc.
  • Page 161 SV Prepare Fault snapshot state is active. Summary/Details Clicking the [Execute] button displays the following confirmation dialog. Figure 5-80: Confirmation Clicking the [Yes] button displays the following dialog indicating the system is during processing. 10400422-002 02/2013  5-81 ©2013 Overland Storage, Inc.
  • Page 162 • If the target base-volume is also used as MV, the synchronous state of the pair is not Separate Preparing or Sync Preparing. • The state of the target base-volume is not snapshot fault. 10400422-002 02/2013  5-82 ©2013 Overland Storage, Inc.
  • Page 163 • Select a snapshot-volume from the information list display area. Then, right-click on the mouse and select [Snapshot Restoration]. Figure 5-83: Restoration From the list, select the snapshot-volume you want to restore, and then click the [Execute] button. 10400422-002 02/2013  5-83 ©2013 Overland Storage, Inc.
  • Page 164 Execute the operation for a snapshot-volume whose SV Preparing snapshot state is active. Execute the operation for a snapshot-volume whose SV Prepare Fault snapshot state is active. Retry after data migration is completed. BV Data Being Migrated 10400422-002 02/2013  5-84 ©2013 Overland Storage, Inc.
  • Page 165 If the new generation is guarded, you cannot select delete and execute restoration. Clicking the [Execute] button displays one of the following confirmation dialog according to the restoration conditions.. Figure 5-84: Base-volume Unmounted Confirmation Figure 5-85: Base-volume Capacity Figure 5-86: Base-volume Unmounted 10400422-002 02/2013  5-85 ©2013 Overland Storage, Inc.
  • Page 166 To check the progress of the restoration process or whether the restoration is completed, close the execution dialog and return to the snapshot management screen. 10400422-002 02/2013  5-86 ©2013 Overland Storage, Inc.
  • Page 167 If "Unexecutable" is shown in the[ Execution Result] field, the volume does not meet the execution conditions and therefore cannot be selected. If there is any unexecutable volume, refer to the [Unexecutable Information] and take one of the following actions. 10400422-002 02/2013  5-87 ©2013 Overland Storage, Inc.
  • Page 168 • The state of the target base-volume is not snapshot fault. • If the target base-volume is also used as MV, the synchronous state of the pair is not Separate Preparing, Sync Preparing, or Restore Preparing. 10400422-002 02/2013  5-88 ©2013 Overland Storage, Inc.
  • Page 169 If there is any unexecutable volume, refer to the [Unexecutable Information] and take one of the following actions. Unexecutable Action Information The guard has already been canceled. SV Guard Cancel Retry after restarting the monitoring of the disk array. Monitoring Suspended 10400422-002 02/2013  5-89 ©2013 Overland Storage, Inc.
  • Page 170 • Select a link-volume from the information list display area. Then, right-click on the mouse and select [Link Setting]. If the selected link-volume already has any connected volume, the following confirmation dialog is displayed. 10400422-002 02/2013  5-90 ©2013 Overland Storage, Inc.
  • Page 171 If there is no volume for which link setting can be executed, "Without correspondence" is displayed. Select the logical disk for which link setting is to be executed. 10400422-002 02/2013  5-91 ©2013 Overland Storage, Inc.
  • Page 172 If a snapshot-volume is specified as the destination-volume, clicking the [Execute] button displays the following confirmation dialog. Figure 5-95: Destination Confirmation If the base-volume is specified as the destination-volume, clicking the [Execute] button displays the following confirmation dialog. 10400422-002 02/2013  5-92 ©2013 Overland Storage, Inc.

  • Page 173: Unlinking

    Display the Unlink screen using one of the following procedures. • Select a link-volume from the information list display area. Then, from the menu bar of the snapshot management screen, select [Operation] - [Link-volume Operation]- [Unlink]. 10400422-002 02/2013  5-93 ©2013 Overland Storage, Inc.
  • Page 174 The link-volume is already unlinked. LV Unconnecting Retry after restarting the monitoring of the disk array. Monitoring Suspended Retry after defreezing the replication function. Freezing Summary Clicking the [Execute] button displays the following confirmation dialog. 10400422-002 02/2013  5-94 ©2013 Overland Storage, Inc.

  • Page 175: Changing Access Mode

    [Operation] - [Link-volume Operation] - [Access Mode Change]. • Select a link-volume from the information list display area. Then, right-click on the mouse and select [Access Mode Change]. 10400422-002 02/2013  5-95 ©2013 Overland Storage, Inc.
  • Page 176 This operation cannot be executed because a restore fault Restore fault occurred in the target link-destination base-volume. This operation cannot be executed because a snapshot SV fault fault occurred in the target link-destination base-volume. 10400422-002 02/2013  5-96 ©2013 Overland Storage, Inc.
  • Page 177 To execute the access mode change operation, the following conditions must be satisfied. • The target link-volume is connected. • The target destination-volume is a snapshot-volume. • The disk array is being monitored. • The disk array is not in the freeze state. 10400422-002 02/2013  5-97 ©2013 Overland Storage, Inc.

  • Page 178: Displaying The Volume Connection Status

    Figure 5-102: Connection Disk Array Name Displays the name of the disk array where the volume exists (or SAA). The disk array name of the volume selected to display the Connection screen is highlighted. 10400422-002 02/2013  5-98 ©2013 Overland Storage, Inc.
  • Page 179 The estimate of remaining time may not be correct because it changes according to the monitoring timing, the units, the status of lines and so on. For between replication related volumes Activity State: 10400422-002 02/2013  5-99 ©2013 Overland Storage, Inc.
  • Page 180 Characters displayed in a volume indicate the attribute of the volume. Attribute Description Base-volume Master volume Replication volume Volume that pairs RV further as MV, and has both the RV attribute and RV/MV the MV attribute 10400422-002 02/2013  5-100 ©2013 Overland Storage, Inc.
  • Page 181 Volumes are classified in colors (layer colors) by alignment of the connection state or types of the displayed volumes. Snapshot related volumes (1) BV: Navy blue (2) SV: Light purple (3) LV: White 10400422-002 02/2013  5-101 ©2013 Overland Storage, Inc.
  • Page 182 (3) 2nd layer: Blue (4) 3rd layer: Yellow Figure 5-104: Color Layers *To distinguish the upper most MV in a hierarchical structure from other MVs, it is called a Primary Volume (PV). 10400422-002 02/2013  5-102 ©2013 Overland Storage, Inc.
  • Page 183 During copy operation, an arrow (the color of the disk) on a connection line indicates the copy state, moving from the copied volume to the copy destination. Figure 5-105: Connection Link of Volumes 10400422-002 02/2013  5-103 ©2013 Overland Storage, Inc.
  • Page 184 SnapSAN S3000/S5000 Snapshot User Guide Display of Link State The link states of link-volumes are shown below. • For a link-volume and a snapshot-volume Figure 5-106: Link State Display 10400422-002 02/2013  5-104 ©2013 Overland Storage, Inc.
  • Page 185 SnapSAN S3000/S5000 Snapshot User Guide Figure 5-107: Copy Progress 10400422-002 02/2013  5-105 ©2013 Overland Storage, Inc.
  • Page 186 Snapshot screen or the Replication screen, the operation menu is displayed, but you cannot select any operation because no operation cannot be executed. For a volume displayed as "Not managed" or "Unpaired", you cannot display the operation menu by right-clicking. 10400422-002 02/2013  5-106 ©2013 Overland Storage, Inc.

  • Page 187: Csv Output Of Information List

    Pool Name","SV PD Type","LV Number","LV OS Type","LV Logical Disk Name","LV Mode" "BV","0004h","NX","DBsvr_01","Normal","","","33.2","DBServer","0000h", "Pool0000","FC","","","","" "Snapshot-volume" "Type","SV Number","SV OS Type","SV Logical Disk Name","Status","Guard","Link","Creation Time","Generation Number","Generation Attribute","Used Capacity[GB]","Restore Different Value[GB]","LV Number","LV OS Type","LV Logical Disk Name","LV Mode" "SV","0009h","NX","DBsvr_01_SV0","Inactive","","","","","","","","","","" 10400422-002 02/2013  5-107 ©2013 Overland Storage, Inc.
  • Page 188 Set the interval of acquisition of the used snapshot capacity information to be displayed on the screen. The interval is the amount of time between one successful information acquisition attempt and the next. 10400422-002 02/2013  5-108 ©2013 Overland Storage, Inc.

  • Page 189: Updating To The Latest Information

    • Select a disk array from the information list display area or configuration display area. Then, from the menu bar, select [View] [Properties]. • Select the information list display area or configuration display area, right-click on the mouse, and then select [Properties]. 10400422-002 02/2013  5-109 ©2013 Overland Storage, Inc.
  • Page 190 • Select a link-volume from the information list display area. Then, from the menu bar, select [View] - [Properties]. • Select a link-volume from the information list display area, right-click on the mouse, and then select [Properties]. Figure 5-112: Volume List Properties 10400422-002 02/2013  5-110 ©2013 Overland Storage, Inc.

  • Page 191: Displaying Snapshot Information

    Displays the information about the paring relationship between base-volume and snapshot-volume, as well as the snapshot status, creation time, and generation number. • Link information Displays the information about the link-volume connection and access mode. 10400422-002 02/2013  5-111 ©2013 Overland Storage, Inc.
  • Page 192 • Volume-link configuration information Displays the information about the connection between base-volume and link-volume or between snapshot-volume and link-volume. • SRA configuration information Displays a list of snapshot data volumes in the SRA. 10400422-002 02/2013  5-112 ©2013 Overland Storage, Inc.
  • Page 193 SnapSAN S3000/S5000 Snapshot User Guide Displaying Snapshot Information Figure 5-114: SnapSAN Manager Client Figure 5-115: SnapSAN Manager Status 10400422-002 02/2013  5-113 ©2013 Overland Storage, Inc.

  • Page 194: Configuration Display Command (Ismview)

    LV: Link-volume (virtual volume linked with a BV or SV to allow indirect access) SV*: One type of snapshot-volume that does not have the information used to manage differences in the BV Node No.(h) Displays the node number of the LD. 10400422-002 02/2013  5-114 ©2013 Overland Storage, Inc.
  • Page 195 Snapshot LD doesn't exist. Displaying the Detailed Snapshot Information About a Logical Disk When the -sln option is specified, the command displays the detailed snapshot information about the specified logical disk. Figure 5-117: Detail Information 10400422-002 02/2013  5-115 ©2013 Overland Storage, Inc.
  • Page 196 SnapSAN S3000/S5000 Snapshot User Guide Displaying Snapshot Information 10400422-002 02/2013  5-116 ©2013 Overland Storage, Inc.
  • Page 197 Snapshot Pool doesn't exist. Displaying the detailed snapshot information about a pool When the -spln or -splm option is specified, the command displays the detailed snapshot information about the specified pool. 10400422-002 02/2013  5-117 ©2013 Overland Storage, Inc.

  • Page 198: Snapshot Configuration Information File Output Function

    The disk array configuration information can be obtained as a text format or CSV format file using the SnapSAN Manager Configuration Setting screen, configuration display command (iSMview), and configuration information file output command (iSMcsv). The obtained disk array configuration information includes the snapshot configuration information. 10400422-002 02/2013  5-118 ©2013 Overland Storage, Inc.
  • Page 199 Configuration Information File Output Command (iSMcsv) The configuration information file output command (iSMcsv) outputs all obtained disk array configuration information to a CSV format file, as in the example shown below. > iSMcsv -arrayname Storage001 -out D:\tmp 10400422-002 02/2013  5-119 ©2013 Overland Storage, Inc.

  • Page 200: Chapter 6 - Snapcontrol

    Creation/Display information with system dependent information (server side) and displays the associated information. iSMsc_create Snapshot creation Creates a snapshot (SV).   iSMsc_restore Restoration from Restores from a snapshot (SV).   snapshot 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 201 • All commands can be used after SnapControl has been installed. • Command No.1 can be used also for SnapSAN Manager and ReplicationControl. • Commands No.11 to No.17 can be used also for ReplicationControl. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 202: Operation Types

    They are not used for joint operations with SnapSAN Manager. Command Name Operation Direct Operation of Operation Linked Disk Array with SnapSAN Manager Volume List Creation/Display  iSMvollist Snapshot creation   iSMsc_create 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 203 *1 If the control volume is not used, the operation is available only from the server (OS) that recognizes *2 Only the volume of the system recognized by the server can be operated. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 204 The application server to which BV is connected can operate BV directly, and no control volume is needed normally. When the backup server uses SVs, snapshot operations can also be performed from the backup server by preparing control volumes. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 205 • A control volume must always be accessible so that an I/O can surely be issued to a disk array from a server (OS) during operation. Therefore, do not perform pair setting for a logical disk bound as a control volume, as RV. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 206: Operations Linked With Snapsan Manager

    • Since operation is performed through the SnapSAN Manager, connection to the disk array and issuing an I/O to the disk array can be performed through LAN. Figure 6-4: Operation Linked with SnapSAN Manager For operations linked with the SnapSAN Manager:. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 207: Volume Types

    (-1) to identify an SV corresponding to a BV. Specified when the snapshot of the oldest cyclic   Cyclic generation generation is deleted as a new snapshot is created. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 208: Operation Volume Setting File

    The following example shows a description in the operation volume setting file: Example for the Windows system To specify the operation volume setting file, use the -file option together with the snapshot operation commands. 10400422-002 02/2013  ©2013 Overland Storage, Inc.

  • Page 209: Log Output

    Process number (thread The process number may be up to 10 decimal digits in length. number) The thread number is displayed only on Windows. Displays the error level. Error level 10400422-002 02/2013  6-10 ©2013 Overland Storage, Inc.

  • Page 210: Volume List Creation/Display

    There are multiple buses in the host adapter. • Bus number: Bus This is the number for the path (bus) from the host adapter to a target (SCSI device). One path can handle multiple targets. 10400422-002 02/2013  6-11 ©2013 Overland Storage, Inc.

  • Page 211: [Main Options]

    Displays information only associated with specified disk arrays sorted by using physical disk number as the key. If a specific physical disk number is specified, -dp option the system displays information only associated with the specified physical disk number. 10400422-002 02/2013  6-12 ©2013 Overland Storage, Inc.
  • Page 212 Message 11933 is output if the specified volume is not iSCSI volume. Displays iSCSI information of all iSCSI volumes for the specified disk array. -arrayname option Message 11933 is output if there is no iSCSI volume. 10400422-002 02/2013  6-13 ©2013 Overland Storage, Inc.
  • Page 213 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-14 ©2013 Overland Storage, Inc.
  • Page 214 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-15 ©2013 Overland Storage, Inc.
  • Page 215 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-16 ©2013 Overland Storage, Inc.
  • Page 216 SnapSAN S3000/S5000 Compliance (WORM) User Guide [Execution Condition] To perform the command operation on Windows, the following condition must be satisfied. 10400422-002 02/2013  6-17 ©2013 Overland Storage, Inc.
  • Page 217 Displays information only associated with specified disk arrays sorted by using logical disk name as the key. If a specific logical disk name is specified, the system displays information only associated with the specified logical disk name. 10400422-002 02/2013  6-18 ©2013 Overland Storage, Inc.
  • Page 218 -arrayname option: Displays iSCSI information of all iSCSI volumes for the specified disk array.Message 11933 is output if there is no iSCSI volume. * The -tgt option is supported only for Linux. 10400422-002 02/2013  6-19 ©2013 Overland Storage, Inc.
  • Page 219 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-20 ©2013 Overland Storage, Inc.
  • Page 220 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-21 ©2013 Overland Storage, Inc.
  • Page 221 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-22 ©2013 Overland Storage, Inc.
  • Page 222 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-23 ©2013 Overland Storage, Inc.
  • Page 223 [Screen Configuration] To create or display the volume list with GUI, use the Volume List Display screen. The following is the layout of the Volume List Display screen. Figure 6-6: Volume List Display 10400422-002 02/2013  6-24 ©2013 Overland Storage, Inc.
  • Page 224 Clicking the pull-down button displays the list of disk arrays currently registered in the volume list file. Drive Letter/Path Name Displays path information in the volume list file. Icon Description Indicates logical disks that can be used from the server. 10400422-002 02/2013  6-25 ©2013 Overland Storage, Inc.
  • Page 225 Displays PD Type information in the volume list file. Display Description Indicates that the physical disk type is FC. Indicates that the physical disk type is ATA. Indicates that the physical disk type is SAS. 10400422-002 02/2013  6-26 ©2013 Overland Storage, Inc.
  • Page 226 Indicates that the physical disk type is NLSAS. Target Name Displays Target information in the logical disk. Starting/Terminating Volume List Display This section describes the procedures for starting and terminating the Volume List Display function. 10400422-002 02/2013  6-27 ©2013 Overland Storage, Inc.
  • Page 227 The information of only the selected disk array is displayed. Select the target disk array from the disk array Selection Combo box on the Volume List Display screen. The volume information on the selected disk array is listed. 10400422-002 02/2013  6-28 ©2013 Overland Storage, Inc.
  • Page 228 Clicking the [OK] button executes Create/Update Volume List. Clicking the [Cancel] button cancels Create/Update Volume List and returns to the Volume List Display screen. The following message appears when the volume list has been created/updated successfully. 10400422-002 02/2013  6-29 ©2013 Overland Storage, Inc.
  • Page 229 When the [Cancel] button is clicked, the screen is returned to the Volume List Display screen without saving the file. When the file has been saved successfully, the following message appears: Figure 6-12: CSV Output Information List 10400422-002 02/2013  6-30 ©2013 Overland Storage, Inc.
  • Page 230 Disk Array: Disk array name PD Type: PD Type Displaying Property Information of Volume List To check property information of the volume list, select [File] - [Properties] on the Volume List Display screen. 10400422-002 02/2013  6-31 ©2013 Overland Storage, Inc.
  • Page 231 To select whether to view or hide the toolbar, specify [View] - [Toolbar]. Figure 6-15: Viewing Toolbar Figure 6-16: Hiding Toolbar View/Hide Status Bar To select whether to view or hide the status bar, specify [View] - [Status Bar]. 10400422-002 02/2013  6-32 ©2013 Overland Storage, Inc.
  • Page 232 When the volume list is created or updated, the disk array identifies the control volume attribute from the logical disks connected to the server and registers it on the volume list. 10400422-002 02/2013  6-33 ©2013 Overland Storage, Inc.
  • Page 233 Displays logical disks that can be registered as a control   volume. When the Define Control Volume screen is started, if an error is detected in the saved definition information, one of the following icons indicating an error appears. 10400422-002 02/2013  6-34 ©2013 Overland Storage, Inc.
  • Page 234 As a control volume, select a standard volume that is not used by data replication or snapshot. Allocate the control volume as a dedicated volume and do not store business data in it. 10400422-002 02/2013  6-35 ©2013 Overland Storage, Inc.
  • Page 235 To register or change a control volume, select the logical disk to be used as a control volume from [Candidate Volume List] and click the [Add] or [Update] button. Figure 6-20: Register Control Volume Figure 6-21: Change Control Volume 10400422-002 02/2013  6-36 ©2013 Overland Storage, Inc.
  • Page 236 [Selected Volume List] and click the [Delete] button. Figure 6-23: Delete Control Volume When you click the [OK] button on the Define Control Volume screen, the message for confirming whether to save the definition information appears. 10400422-002 02/2013  6-37 ©2013 Overland Storage, Inc.
  • Page 237 Select [File] - [Create/Update Volume List] from the Volume List Display screen to create and update the volume list, and reflect the saved definition information of the control volume to the volume list for registration. 10400422-002 02/2013  6-38 ©2013 Overland Storage, Inc.
  • Page 238 LV, a snapshot creation by cyclic creation of the snapshot creation command fails. When SnapControl is operated in cooperation with SnapSAN Manager, a snapshot is created for the next oldest generation except for the linked SVs. 10400422-002 02/2013  6-39 ©2013 Overland Storage, Inc.
  • Page 239 • The specified BV is not being restored, or prepared for restoration from other generations. • The target SV is not protected. • The target SV is not linked with the LV. 10400422-002 02/2013  6-40 ©2013 Overland Storage, Inc.
  • Page 240 • Specification of the BV (-bv volume -bvflg bv_flg) Specify the volume and volume type of the BV. • Specification of the SV (-sv volume -svflg sv_flg) Specify the volume and volume type of the SV. 10400422-002 02/2013  6-41 ©2013 Overland Storage, Inc.
  • Page 241 Operations can be performed for a volume consisting of multiple partitions, by changing the settings in the operation option setting file. 10400422-002 02/2013  6-42 ©2013 Overland Storage, Inc.
  • Page 242 • The activity state of other SVs set in the specified BV is not being deleted, restored, or prepared for restoration. • The target SV is not protected. • The target SV is not linked with the LV. 10400422-002 02/2013  6-43 ©2013 Overland Storage, Inc.
  • Page 243 On the UNIX system, if the BV file system is mounted, the command terminates abnormally without starting the restoration operation. It is therefore necessary to unmount the BV file system in advance. [Main Options] For the iSMsc_restore command, you can specify the following options. 10400422-002 02/2013  6-44 ©2013 Overland Storage, Inc.
  • Page 244 • Derived SV keep mode (-derivsv keep) Snapshots including those of which generation is later than the restored generation are kept. The default value follows the operation option setting file or setting of environment variables. 10400422-002 02/2013  6-45 ©2013 Overland Storage, Inc.
  • Page 245 • In the derived SV auto delete mode, no protected SV exists in any generation newer than the one of the target SV. • The target BV is unlinked. • The target SV is not linked with the LV. 10400422-002 02/2013  6-46 ©2013 Overland Storage, Inc.
  • Page 246 • Specification of the BV (-bv volume -bvflg bv_flg) Specify the volume and volume type of the BV. • Specification of the SV (-sv volume -svflg sv_flg) Specify the volume and volume type of the SV. 10400422-002 02/2013  6-47 ©2013 Overland Storage, Inc.
  • Page 247 • No limit (-limit nolim) The waiting is performed unlimitedly. The default value can be specified by SNAP_LIMWATCHDEV in the operation option setting file for Windows and environment variable SNAP_LIMWATCHDEV for UNIX. 10400422-002 02/2013  6-48 ©2013 Overland Storage, Inc.
  • Page 248 SNAP_WAITMSG. For the environment variable, refer to the "ControlCommand Command Reference". ld-name: Logical disk name type: OS Type special-file-name: Special file name generation: SV relative generation number snap_status: SV snapshot status 10400422-002 02/2013  6-49 ©2013 Overland Storage, Inc.
  • Page 249 When both BV and SV are specified: Displays the information of the BV and the target SV. When only the SV is specified: Displays the same information that is presented when the BV and SV are both specified. 10400422-002 02/2013  6-50 ©2013 Overland Storage, Inc.
  • Page 250 Only "-" is displayed for the SV that became a derived generation until a new generation number is given by recreating a snapshot. snap_status: SV snapshot status YYYY/MM/DD hh:mm:ss: Snapshot creation time link_sts: SV link status 10400422-002 02/2013  6-51 ©2013 Overland Storage, Inc.
  • Page 251 :BV OS Type volume name: Mount point volume name path: Drive letter or path name mounted to the folder of the NTFS volume accessed by users bv_state: BV state sv_ld_name: SV logical disk name 10400422-002 02/2013  6-52 ©2013 Overland Storage, Inc.
  • Page 252 Type: bv_type Special File: special_file_name State: bv_state SV Information Type:LdName1 (-n) snap/state [YYYY/MM/DD hh:mm:ss] link_sts Type:LdName2 (-n) snap/state [YYYY/MM/DD hh:mm:ss] link_sts Type:LdName3 (-n) snap/state [YYYY/MM/DD hh:mm:ss] link_sts Description bv_ld_name: BV logical disk name 10400422-002 02/2013  6-53 ©2013 Overland Storage, Inc.
  • Page 253 Processing Data Size: bbbbbbbbKB Snapshot Data Size: ddddddddKB SV Guard: preserve_mode LV Link Status: link_sts LV: LD Name: lv_ld_name Type: lv_type Special File: lv_special_file_name LV Access: access_mode Description bv_ld_name: BV logical disk name 10400422-002 02/2013  6-54 ©2013 Overland Storage, Inc.
  • Page 254 • When a disk group is specified, the target disk group is active. • The iSM-only special file is not being created (HP-UX system and Linux system only). Snapshot Guard Classification Setting/Cancellation Command The iSMsc_svguard command is used for setting/canceling a snapshot guard classification. 10400422-002 02/2013  6-55 ©2013 Overland Storage, Inc.
  • Page 255 BV:ld_nametype Volume Name: volume name Path: path SV:ld_nametype Generation: generation Status: snap_status [YYYY/MM/DD hh:mm:ss] Description ld_name: Logical disk name type: OS Type volume name: Mount point volume name 10400422-002 02/2013  6-56 ©2013 Overland Storage, Inc.
  • Page 256 • If the target BV is paired as the RV for replication, the MV paired with the RV is registered in the volume list. • The volume list is not being created. 10400422-002 02/2013  6-57 ©2013 Overland Storage, Inc.
  • Page 257 • The logical disk capacity and OS type of the specified LV matches those of the destination-volume. • The specified LV has not yet to be linked. • The specified destination-volume has not yet to be linked. 10400422-002 02/2013  6-58 ©2013 Overland Storage, Inc.
  • Page 258 If only the LV is specified, the BV or the SV currently linked with it is unlinked. For the volume types, refer to 4.3 "Volume Types". [Displayed Information] The iSMsc_unlink command outputs the following messages. (Common to Windows/UNIX) 10400422-002 02/2013  6-59 ©2013 Overland Storage, Inc.
  • Page 259 Specify whether or not to display the link control list. [Displayed Information] The iSMsc_linkinfo command displays the following information. On the Windows system Specified Volume Information aa:LD Name: ld_name Type: type Volume Name: volume_name Path: path State: link_sts (ld_name) 10400422-002 02/2013  6-60 ©2013 Overland Storage, Inc.
  • Page 260 (ld_name)2: Link status. If the link is established, the name of the destination- volume is displayed. access_mode2: Access restrictions On the UNIX system Specified Volume Information aa:LD Name: ld_name Type: type Special File: special_file_name State: link_sts (ld_name) Mode: access_mode 10400422-002 02/2013  6-61 ©2013 Overland Storage, Inc.
  • Page 261 The following notes do not apply to joint operation with iSM. • The volume list is not being created or updated. • The iSM-only special file is not being created (HP-UX system and Linux system). Displaying Logical Disk Information 10400422-002 02/2013  6-62 ©2013 Overland Storage, Inc.
  • Page 262 -node option is specified. Specify this option together with the -a option or -de option. [Displayed Information] When the -a option or the -de option is specified: Logical disk information as shown below is listed. 10400422-002 02/2013  6-63 ©2013 Overland Storage, Inc.
  • Page 263 • ATA Logical disk configured of physical disks with the ATA attribute • SAS Logical disk configured of physical disks with the SAS attribute • SSD Logical disk configured of physical disks with the SSD attribute 10400422-002 02/2013  6-64 ©2013 Overland Storage, Inc.
  • Page 264 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-65 ©2013 Overland Storage, Inc.
  • Page 265 In addition, for a logical disk defined as a control volume on the server, the attribute is not displayed. Particular Volume Information Display Command The iSMrc_sense command is used for displaying a particular volume information. [Main Options] For the iSMrc_sense command, you can specify the following options. 10400422-002 02/2013  6-66 ©2013 Overland Storage, Inc.
  • Page 266 When the -protect option is specified: Disk No. disk_number LD Name ld_name VAAv aa Type type Volume Namev olume_name Path path Protection Information Protection State protection_state Begin Date begin_date Retention Date retention_date Retention Mode retention_mode Reinitialize reinitialize_state 10400422-002 02/2013  6-67 ©2013 Overland Storage, Inc.
  • Page 267 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-68 ©2013 Overland Storage, Inc.
  • Page 268 SnapSAN S3000/S5000 Compliance (WORM) User Guide 10400422-002 02/2013  6-69 ©2013 Overland Storage, Inc.
  • Page 269 • When a volume group is specified, the target volume group is active. • When a disk group is specified, the target disk group is active. • The iSM-only special file is not being created (HP-UX system and Linux system only). 10400422-002 02/2013  6-70 ©2013 Overland Storage, Inc.
  • Page 270 NTFS folder name. [Displayed Information] The iSMrc_flush command displays the following messages when Flush starts and ends. [Start message] Flush StartYYYY/MM/DD hh:mm:ss disk_numberld_nametype volume_name path [End message] Flush Normal EndYYYY/MM/DD hh:mm:ss disk_numberld_nametype volume_name 10400422-002 02/2013  6-71 ©2013 Overland Storage, Inc.
  • Page 271 In this case, the specified mount point is set to the target volume and then mount the volume. 10400422-002 02/2013  6-72 ©2013 Overland Storage, Inc.
  • Page 272 Not Ready state when the iSMrc_umount command unmounts the volume. • A dynamic disk cannot be specified. • The update prevention state of the operation target volume is not Prevent by the volume update prevention function. 10400422-002 02/2013  6-73 ©2013 Overland Storage, Inc.
  • Page 273 In addition, even when the volume to be unmounted cannot be locked, the volume is unmounted forcibly. [Displayed Information] The iSMrc_umount command displays the following messages when Unmount starts and ends. [Start message] Umount Start YYYY/MM/DD hh:mm:ss disk_number ld_nametype volume_name 10400422-002 02/2013  6-74 ©2013 Overland Storage, Inc.
  • Page 274 • The update prevention state of the operation target volume is not Prevent by the volume update prevention function. 10400422-002 02/2013  6-75 ©2013 Overland Storage, Inc.
  • Page 275 • Displays a list of signatures saved in the map file and those saved in the disk array or displays the signatures of the specified physical disk. • Exporting signature to a file (-export) • Writes the signature information to the specified file. 10400422-002 02/2013  6-76 ©2013 Overland Storage, Inc.
  • Page 276 Displays the link state when the target physical disk is the link-volume (LV) used for the snapshot function. Displays "-" (hyphen), unless the target is a link-volume. • linkConnected • unlinkUnconnected 10400422-002 02/2013  6-77 ©2013 Overland Storage, Inc.
  • Page 277 The iSMrc_scan command may take tens of seconds to complete the operation. [Start message] Scan Start YYYY/MM/DD hh:mm:ss [End message] Scan Normal End YYYY/MM/DD hh:mm:ss Description YYYY/MM/DD hh:mm:ss: Start/End time (Year Month Day Hour Minute Second) 10400422-002 02/2013  6-78 ©2013 Overland Storage, Inc.
  • Page 278 Execution Range The execution range of a SnapControl command is a snapshot-volume associated respectively with a volume accessible from a server and a paired volume. Figure 6-27: Execution Range of Snapshot Operations 10400422-002 02/2013  6-79 ©2013 Overland Storage, Inc.
  • Page 279 • If a server is UNIX, remote operations cannot be executed while an iSM-only special file is created (while the iSMmknod command is executed). • When a server is Windows, the execution account needs to be Administrator's privilege. 10400422-002 02/2013  6-80 ©2013 Overland Storage, Inc.
  • Page 280 • SDVs to be bound = SDV(0), SDV(1), ... SDV(N-1) • SDV(0) capacity = SDV(1) =, ... = SDV(N-2) = 2046 GB • SDV(N-1) capacity*3 = [(Data area + management area) mod 2046 GB] + (N - 1) m 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 281 Data area = 2044 GB Example 3: When the user-specified capacity is 2045 GB Data area = 2045 GB Example 4: When all the free space of the pool is specified (free pool space = 2000 GB*1) 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 282 SDV capacity is 2046 GB, expanding the snapshot reserve area beyond this limit requires binding new SDVs as described in A.2 "About Binding from iSM". In the following examples, the size of the management area per SDV is 1 MB. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 283 When using a GPT disk When using partition disks in GPT (GUID partition table) format, pay attention to the following. • The OS type of the operation target logical disk must be set to "WG". 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 284 BV and SV (LV) paired for snapshot operations must have the same type of partitions and file systems. If these rules are not observed, data consistency is not guaranteed. Use the same type of partition and file system for BV and SV (LV). 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 285 Do not use Read Only (RO) unless you are familiar with the operating system and file system operations. You can set a link to SV only while a snapshot is activated (snap/active). 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 286 To use a snapshot on a backup server, create a snapshot according to the instruction to create a snapshot. For guaranteeing data consistency, a static point is specified on an application server before snapshot creation. Usually a static point is specified by 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 287 • If tape device is connected to application server, restore data from tape to BV directly. • Set a link from LV to BV and restore data from tape to BV directly on a backup server. • Restore data from SV to BV. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 288 For a logical disk used as a control volume, the RAID format and capacity are not limited. You can build a small-capacity logical disk dedicated for a control volume. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 289 • Only a logical drive on the primary partition or expanded partition can be selected as a target volume for snapshot operation. Also only a basic disk can be used. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 290 When you execute forcible unmounting, you can execute the iSMrc_umount command with the -force option to discard cache data of the SV (LV) file system. However, note that it causes errors in applications and services accessing to the drive. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 291 (MOUNTVOL /N) before operation. • VERITAS VxVM is not supported. • Note the following, when unmounting LV by the iSMrc_umount command or when unmounting a volume using the -offline option. 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 292 To create a snapshot using the RV of Volume Cloningas the BV, the RV must be separated (separated). When you perform Separate (immediate) of the replication function, the RV becomes available (available for read or write), however, a snapshot cannot be created. Wait for separated (separated). 10400422-002 02/2013  A-10 ©2013 Overland Storage, Inc.
  • Page 293 For terms and conditions for use, reproduction, and distribution, see: http://www.apache.org/licenses/LICENSE-2.0 Flex License For a copy of the license see: http://arcib.dowling.edu/cgi-bin/info2html?(flex.info.gz)Copyright OpenSSL License For a copy of the current LICENSE file inside the CVS repository see: http://www.openssl.org/ 10400422-002 02/2013  ©2013 Overland Storage, Inc.
  • Page 294 6-10 link setting expanded partition logical disk information display logical disk name file system buffer flush MBR format mdir message ID 6-11 GPT format message text 6-11 10400422-002 02/2013  2013 Overland Storage, Inc.
  • Page 295 6-10 type 6-10 unlinking 10400422-002 02/2013  2013 Overland Storage, Inc.

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