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HP StorageWorks P9000 - Disk Arrays User Manual

Hp storageworks p9000 business copy for mainframe systems user guide (av400-96335, january 2011)
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HP StorageWorks
P9000 Business Copy for Mainframe
Systems User Guide
Abstract
This guide explains how to use HP StorageWorks P9000 Business Copy for Mainframe Software to create nondisruptive,
high-speed internal copies of information stored by open-systems hosts on HP Storage Works P9000 disk arrays and attached
heterogeneous external storage systems. Topics include how to create, split, suspend, resynchronize, and troubleshoot Business
Copy pairs using the Remote Web Console web client. The intended audience is a storage system administrator or authorized
service provider with independent knowledge of HP StorageWorks P9000 disk arrays and the HP StorageWorks Remote Web
Console.
HP Part Number: AV400-96335
Published: January 201 1
Edition: Third

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Summary of Contents for HP StorageWorks P9000 - Disk Arrays

  • Page 1 HP StorageWorks P9000 Business Copy for Mainframe Systems User Guide Abstract This guide explains how to use HP StorageWorks P9000 Business Copy for Mainframe Software to create nondisruptive, high-speed internal copies of information stored by open-systems hosts on HP Storage Works P9000 disk arrays and attached heterogeneous external storage systems.
  • Page 2 © Copyright 2010, 201 1 Hewlett-Packard Development Company, L.P. Confidential computer software. Valid license from HP required for possession, use or copying. Consistent with FAR 12.21 1 and 12.212, Commercial Computer Software, Computer Software Documentation, and Technical Data for Commercial Items are licensed to the U.S. Government under vendor's standard commercial license.

  • Page 3: Table Of Contents

    Contents 1 Business Copy Z overview................6 Business Copy Z software......................6 How Business Copy Z works......................6 Hardware and software components ..................6 Volume pairs (S-VOLs and T-VOLs)..................7 Remote Web Console GUI....................7 PPRC, Business Continuity Manager, and consistency groups.............7 Initial and update copy operations....................7 Initial copy .........................8 Update copy ........................8 2 Requirements and planning...............10...
  • Page 4 Split and create pairs......................27 Splitting consistency group pairs with At-Time Split ..............29 Suspend pair creation......................30 Resynchronize pairs........................31 Delete pairs...........................34 6 Monitoring and maintaining the system............36 Monitoring the system ......................36 Monitoring pair activity, status ....................36 Pair status definitions.....................36 Status, permitted pair operations..................38 Reviewing pair, volume details.....................38 Reviewing pair, license information ..................39 Reviewing a pair’s operation history..................41...
  • Page 5 CQUERY..........................60 PPRCOPY QUERY......................61 Output descriptions......................61 B Business Copy Z GUI reference..............63 Pair Operation window......................63 Main components ......................63 Volume List........................64 Preview List........................65 Pair Operation command menu...................66 Display Filter dialog box.....................66 History window........................67 Option window........................69 CTG window.........................69 CTG command menu......................70 Glossary....................72 Index......................75 Contents...

  • Page 6: Business Copy Z Overview

    1 Business Copy Z overview Unless otherwise specified, the term P9000 in this guide refers to the following disk array: P9500 Disk Array The GUI illustrations in this guide were created using a Windows computer with the Internet Explorer browser. Actual windows may differ depending on the operating system and browser used. GUI contents also vary with licensed program products, storage system models, and firmware versions.

  • Page 7: Volume Pairs (S-Vols And T-Vols)

    Figure 1 Business Copy Z configuration Volume pairs (S-VOLs and T-VOLs) A pair consists of the primary and secondary data volume and the volume. Each source volume (S-VOL) can be paired with up to three target volumes (T-VOLs). Thus, you can create three pairs using one S-VOL.

  • Page 8: Initial Copy

    Initial copy When you create a pair, the initial copy is started by the system, and all the data in the S-VOL is copied to the T-VOL. Before the pair creation the pair’s status is Simplex. While the initial copy is in progress, the status is Pending. The status changes to Duplex when the initial copy is complete.
  • Page 9 Figure 3 Update copy operation Although an initial copy completes and pair status changes to Duplex, the data in the S-VOL and T-VOL may not be the same because the copy of the update data is performed asynchronously. To ensure that S-VOL and T-VOL data are the same at a certain point in time, the pair must be split. CAUTION: If the copy operation is completed without any host I/O, the data in the S-VOL and the data in the T-VOL may not be the same.

  • Page 10: Requirements And Planning

    2 Requirements and planning This chapter describes system requirements and recommendations for planning a Business Copy Z system. System requirements The following table shows minimum requirements for Business Copy Z. Table 1 System requirements Item Requirement Business Copy Z license Based on purchased capacity.

  • Page 11: License Capacity Requirements

    Table 1 System requirements (continued) Item Requirement Maximum Number of Pairs Maximum number possible per storage system is 16,384 pairs (when one T-VOL per S-VOL). Actual number is based on amount of additional shared memory. See “Planning number of pairs” (page 11) for further information.

  • Page 12: Calculating Number Of Differential Tables, Pair Tables

    The number of differential and pair tables that are present in the system depends on additional shared memory that is installed. Therefore, you must insure that you have sufficient additional shared memory to handle the number of pairs. The following table shows the number of differential and pair tables and the number of volumes allowed per additional shared memory.

  • Page 13: Calculating Maximum Number Of Pairs

    Table 3 Control cylinders per emulation type Emulation type Number of control cylinders 3380-3, 3380-3A, 3380-3B, 3380-3C 3390- 1 3390-2, 3390-3, 3390-3A, 3390-3B, 3390-3C, 3390-3R 3390-9, 3390-9A, 3390-9B, 3390-9C 3390-L, 3390-LA, 3390-LB, 3390-LC 3390-M, 3390-MA, 3390-MB, 3390-MC Having determined the number of differential and pair tables required per pair on your storage system, you can now calculate the maximum number of pairs.

  • Page 14: Planning For Performance

    Table 4 Volume information for Business Copy Z for z/OS (continued) LDEV S-VOL? Associated T-VOLs T-VOL? Associated S-VOL 0:2E, 0:2F 0:00 0:00 0:01 etc... Planning for performance Pair operations affect I/O performance on the storage system. The following information is provided to help calibrate your system: Performance versus number of pairs.

  • Page 15: System Options

    See the HP StorageWorks P9000 Performance for Open and Mainframe Systems User Guide for more information on settings. CAUTION: It is recommended that Quick Restore should not be performed when the S-VOL and T-VOL are in different CLPRs. If you perform Quick Restore, the CLPR of the S-VOL and the CLPR of the T-VOL will be reversed after Quick Restore.

  • Page 16: Business Continuity Manager, Pprc Operation Commands

    Business Continuity Manager, PPRC operation commands The following table shows Business Continuity Manager and PPRC commands used for the Business Copy Z operations. Table 5 Business Continuity Manager, PPRC command comparison Business Continuity Parameter/Config (support PPRC Parameter Manager method) YKMAKE/YKRESYNC config CESTPAIR DEVN...

  • Page 17: Sharing Business Copy Z Volumes

    3 Sharing Business Copy Z volumes Business Copy Z volumes can be shared with other HP program products. This chapter discusses requirements, recommendations, and restrictions for using Business Copy Z with other products. Virtual LVI Virtual LVI volumes can be assigned to Business Copy Z pairs, provided that the T-VOL has the same capacity as the S-VOL.

  • Page 18: Continuous Access Journal Z

    Access Synchronous Z M-VOL may take extra time depending on the time for copying process of the Business Copy Z pair. The Quick Restore operation can be performed on a Business Copy Z pair when the Continuous Access Synchronous Z pair is suspended. NOTE: When using PPRC, you cannot distinguish between the Split status and the V-Split status.

  • Page 19: Compatible Flashcopy

    Figure 5 Cnt Ac-J Z, Cnt Ac-S Z, and BC Z shared volume configuration 2 All Business Copy Z operations, with the following exceptions, can be performed in the Continuous Access Synchronous Z and Continuous Access Journal Z secondary sites, irrespective of Continuous Access Synchronous Z pair status.

  • Page 20: Compatible Xrc

    Compatible XRC If a Business Copy Z S-VOL and a Compatible XRC source volume (original data) share the same volume, you cannot perform the reverse copy or quick restore operation. Do not use Compatible XRC T-VOLs (copied data) for Business Copy Z volumes. Concurrent Copy If Business Copy Z S-VOLs and Concurrent Copy source volume (original data) share the same volumes, you cannot perform the reverse copy or quick restore operation for those volumes.

  • Page 21: Performing Configuration Operations

    4 Performing configuration operations This chapter provides configuration information and instructions. Configuration workflow Setup for Business Copy Z consists of the following: Ensuring that source and target volumes are set up correctly Reserving volumes for use as T-VOLs (optional) Setting the Host I/O Performance option, which boosts I/O performance, though copy time slows as a result (optional) Set up source and target volumes The source and target volumes must be set up prior to making copies.

  • Page 22: Reserving A Consistency Group

    Ensure that the volumes you want to reserve are shown, and then click OK. The selected volumes display in the Preview List. When ready, on the Pair Operations window click Apply. To confirm the settings are applied, use the Display Filter dialog box. NOTE: LDEVs for S-VOLs and T-VOLs listed in Remote Web Console may end in the following special symbols:...

  • Page 23: Set Host I/O Performance Option

    Procedure 2 To reserve a consistency group Click Actions > Local Copy > Business Copy for Mainframe/Compatible FlashCopy > CTG to open the CTG window. Change to Modify mode by clicking the icon. Select and right-click one or more CTGs with status Free, then select Add CT Group. Click Apply.
  • Page 24 In the Business Copy Z Option window, select the Host I/O Performance box. Click Apply. Performing configuration operations...

  • Page 25: Performing Pair Operations

    5 Performing pair operations This chapter provides instructions for performing pair operations using Remote Web Console. Pair operations workflow A typical operations workflow follows: Check pair status. Each operation requires a pair to have a specific status. You also check pair status to insure that an operation completed successfully.
  • Page 26 Because pair creation affects performance on the host, observe the following: Create a pair when I/O load is light. ◦ Limit the number of pairs that you create simultaneously. ◦ When a pair is created, both LDEVs are allocated to the processor blade that the S-VOL was allocated to before the pair was created.

  • Page 27: Split And Create Pairs

    NOTE: When the Preview List already holds some Add Pair operation settings and you specify a different copy pace for new pairs in the Add Pair dialog box, the copy pace for the existing Add Pair settings displayed in the Preview List will be also changed. The latest copy pace specified in the Add Pair dialog box is always reflected to the storage system.
  • Page 28 At-Time Split, in which all pairs in a copy group are split at the same time. Split time indicates the time when you want to mirror S-VOL data in the T-VOLs. Business Continuity Manager is required. Split all pairs in a consistency group. This operation requires PPRC and is similar to the At-Time Split using Business Continuity Manager.

  • Page 29: Splitting Consistency Group Pairs With At-Time Split

    In the Split Volume Pair dialog box, proceed as follows: Ensure that the pair you want to split is selected. Select the Simplex volume to be the S-VOL in a pair create and split operation. From Copy Pace, select the pace at which the pair(s) are to be split, Slower, Medium, or Faster. Copy Pace affects the host I/O performance: a slower pace minimizes impact, a faster pace has the greatest impact.

  • Page 30: Suspend Pair Creation

    Prerequisite information Make sure to change the status of pairs in the same consistency group according to the copy group. On registering split time: When you register\ the Split time, you can only perform Suspend or Delete pair operations. ◦ Split time is rejected if the Add Pair, Split, or Resync operation is performed.

  • Page 31: Resynchronize Pairs

    Select the pair(s) that you want to suspend (or the volume(s) whose pairs you want to suspend), right-click the selected pair(s) to display the menu, and select the Suspend Pair command to open the Suspend Volume Pair dialog box. On the Suspend Volume Pair dialog box, select the pair(s) you want to suspend, and click OK to reflect the settings to the Preview List on the Pair Operation window.
  • Page 32 In a reverse Quick Resync (called Quick Restore), the S-VOL and T-VOL are swapped. No actual data is copied, and the pair is placed in Duplex status. The S-VOL and T-VOL are inaccessible during this operation. As soon as the Reverse ◦...
  • Page 33 perform Quick Resync, Reverse Copy, or Quick Restore, you issue the PPRC command on one pair. Procedure 8 To resynchronize a pair If the T-VOL is online, set it offline. If you resynchronize T-VOL to S-VOL, set the S-VOL offline, too.

  • Page 34: Delete Pairs

    NOTE: If you try to perform the quick restore operation to the pair you select from the Resynchronize Volume Pair Volume List that is composed of volumes stored in multiple cache logical partitions (CLPRs), a message asking you whether you want to click OK and continue the operation will appear.
  • Page 35 If you selected a pair that you do not want to delete, select the pair on the Delete Pair dialog box, right-click, then click Delete. This removes the pair from the deletion list. Click OK. The Pair Operation reappears. Review the information in the Preview list. Click Apply to commit the operation to the system.

  • Page 36: Monitoring And Maintaining The System

    6 Monitoring and maintaining the system This chapter provides information and instructions for monitoring and maintaining the Business Copy Z system. Monitoring the system Monitoring helps you keep track of pairs and volumes and their current and past conditions. Monitoring should be an ongoing activity. This section provides information for monitoring the following: Pair status.
  • Page 37 Table 6 Pair status definitions (continued) Status Description Host status S-VOL access T-VOL access Duplex The initial copy operation is complete, S-VOL = Read/write-enabled Read/write-disabled the volumes are paired. The system PPRIMARYT-VOL = begins update copy operations from PSECONDRY S-VOL to T-VOL as needed. The S-VOL and T-VOL in Duplex status may not be identical.

  • Page 38: Status, Permitted Pair Operations

    CAUTION: When you execute DEVSERVE to a read/write disabled volume, “INTERVENTION REQUIRED” is returned. However, if you have created pairs with the volumes online, and then execute DEVSERVE to a read/write disabled volume, a normal value is returned. Status, permitted pair operations A pair’s status shows a pair’s condition.

  • Page 39: Reviewing Pair, License Information

    From the volume list, select and right-click the volume or pair whose information you want to see, then select Detail from the menu. The Detail dialog box displays. Field descriptions are provided below. Table 8 Fields in the Detail dialog box Field Description S-VOL Information...
  • Page 40 Right-click on the volume list, in any location, then select Information from the menu. The Information dialog box displays. Field descriptions are provided below. Table 9 Fields in the Information dialog box Field Description Business Copy for Mainframe Shows the number of Business Copy Z pairs/and the total number of pair tables for pair(s) Business Copy and Business Copy Z.

  • Page 41: Reviewing A Pair's Operation History

    Table 9 Fields in the Information dialog box (continued) Field Description Remaining pair table(s) Displays the number of remaining pair tables in the storage system/and the total number of pair tables in the system. For more information, see “Calculating number of differential tables, pair tables”...

  • Page 42: Reviewing Pair Details For A Consistency Group

    To change the displaying order, click a column title in the list. The list will be sorted based on the items in the clicked column. If there are more than 16,384 records of operations, the list will be divided into multiple pages and only the list which is currently displayed will be sorted.

  • Page 43: Maintaining The System

    Table 10 Fields in the CTG window Field Description Consistency groups that can be displayed. S-VOL S-VOL’s LDKC number:CU number:LDEV number Status Pair’s current status T-VOL T-VOL’s LDKC number:CU number:LDEV number Sync Percentage of synchronization between S-VOL and T-VOL Emulation Pair’s emulation type Capacity (Cyl) Volume capacity by number of cylinders...

  • Page 44: Pair Operations During System, Device Maintenance

    Select the volume(s) from which you want to remove the attribute, then click OK. The selected volumes display in the Preview List. To change a selection, right-click, select Modify, and make your changes. When ready, on the Pair Operations window click Apply. Pair operations during system, device maintenance This section provides recommendations for pair operations when maintenance on the P9500 system and related devices are performed.

  • Page 45: Troubleshooting

    7 Troubleshooting This chapter provides information and instructions for troubleshooting the Business Copy Z system. General troubleshooting The following table provides general troubleshooting information for Business Copy Z pairs. Table 1 1 General troubleshooting Error Corrective action Remote Web Console hangs, or Business Make sure all Business Copy Z requirements and restrictions are met.
  • Page 46 The following table describes the DKC SIM (byte 28 = F1) related to Business Copy Z operations. Table 12 Business Copy Z SIMs Reference code Importance level Description SSB22 SSB23 Moderate Copying ends abnormally and pair status changes to Suspend. “x”...

  • Page 47: Support And Other Resources

    8 Support and other resources Contacting HP For worldwide technical support information, see the HP support website: http://www.hp.com/support Before contacting HP, collect the following information: Product model names and numbers Technical support registration number (if applicable) Product serial numbers Error messages Operating system type and revision level Detailed questions Subscription service...

  • Page 48: Conventions For Storage Capacity Values

    http://www.hp.com/support/downloads http://www.hp.com/storage/whitepapers Conventions for storage capacity values P9000 disk arrays use the following values to calculate physical storage capacity values (hard disk drives): 1 KB (kilobyte) = 1,000 bytes 1 MB (megabyte) = 1,000 bytes 1 GB (gigabyte) = 1,000 bytes 1 TB (terabyte) = 1,000 bytes...

  • Page 49: Hp Product Documentation Survey

    WARNING! Indicates that failure to follow directions could result in bodily harm or death. CAUTION: Indicates that failure to follow directions could result in damage to equipment or data. IMPORTANT: Provides clarifying information or specific instructions. NOTE: Provides additional information. TIP: Provides helpful hints and shortcuts.

  • Page 50: A Pair Operations Using Pprc

    A Pair operations using PPRC You can perform Business Copy Z pair operations using TSO PPRC and ICKDSF PPRCOPY commands. This appendix provides PPRC requirements, commands, and examples. It is assumed that you have PPRC command experience. All the instructions for using the PPRC TSO and ICKDSF commands are not provided here.

  • Page 51: Pprc Command Requirements

    PPRC command requirements The following requirements must be met: Business Copy Z must be installed and enabled on the P9500 storage system The serial numbers of the S-VOL and the T-VOL must be defined according to one of the following: ◦...

  • Page 52: Adding Pairs With Cestpair And Pprcopy Estpair

    Adding pairs with CESTPAIR and PPRCOPY ESTPAIR Add pairs using the CESTPAIR and PPRCOPY ESTPAIR commands. The commands are issued to the S-VOL. The T-VOL must be offline. Parameters and examples are provided in the following sections. CESTPAIR The following table describes the CESTPAIR command parameters used to create pairs. Table 17 CESTPAIR parameters Parameter Value...

  • Page 53: Estpair

    ESTPAIR The following table describes the PPRCOPY ESTPAIR command parameters used to create pairs. Table 18 PPRCOPY ESTPAIR parameters Parameters Value Description DDNAME, DDNAME = dname = JCL statement identifying Only one of the three parameters should be SYSNAME, or the volume.

  • Page 54: Splitting Pairs With Csuspend And Pprcopy Suspend

    Splitting pairs with CSUSPEND and PPRCOPY SUSPEND Split pairs using the CSUSPEND AND PPRCOPY SUSPEND commands. The commands are issued to the S-VOL. The pair must be in Duplex status. Parameters and examples are provided in the following sections. CSUSPEND The following table describes the CSUSPEND command parameters used to split pairs.

  • Page 55: Resynchronizing Pairs With Cestpair And Pprcopy Estpair

    Table 20 SUSPEND parameters (continued) Parameters Value Description Primary or secondary volume CU number. If you perform a quick split request on all pairs in a consistency group, confirm that the status of all pairs is DUPLEX. If there are pairs with PENDING status, the quick split operation sometimes ends abnormally (CC = 12). If this occurs, wait until the copy operation for the pair ends.

  • Page 56: Estpair (Resynchronizing Pairs)

    Table 21 CESTPAIR parameters (continued) Parameter Value Description PACE Any number Copy speed is medium, regardless what is specified for the PACE parameter. Other than 1 Copy speed is medium. CRIT Not applicable Not used by Business Copy Z. MSGREQ MSGREQ function is applicable.
  • Page 57 Table 22 PPRCOPY ESTPAIR parameters (resynchronizing pairs) Parameters Value Description DDNAME, DDNAME = dname = JCL statement identifying Only one of the three parameters should be SYSNAME, or the volume. specified. The italic term is the arbitrary name. UNITADDRESS For example, dname is the arbitrary unique SYSNAME = sysxxx = SYSNAME in the ASSGN name of the JCL statement which identifies the system control statement.

  • Page 58: Deleting Pairs With Cdelpair, Delpair

    ESTPAIR with MODE(RESYNC) example Deleting pairs with CDELPAIR, DELPAIR Delete pairs using the CDELPAIR and PPRCOPY DELPAIR commands. The commands are issued to the S-VOL. If the pair is split, the T-VOL can be accessed by the host. If the pair is in any other status than split, non-reserved T-VOLs can be accessed by the host. However, reserved simplex volumes cannot be accessed.

  • Page 59: Consistency Group Pair Operations With Pprc

    Table 24 PPRCOPY DELPAIR parameters Parameters Value Description DDNAME, DDNAME = dname = JCL statement identifying Only one of the three parameters should be SYSNAME, or the volume. specified. The italic term is the arbitrary name. UNITADDRESS For example, dname is the arbitrary unique SYSNAME = sysxxx = SYSNAME in the ASSGN name of the JCL statement which identifies the system control statement.

  • Page 60: Displaying Pair Information With Cquery Tso, Query Ickdsf

    Use the CQUERY or PPRCOPY QUERY command to make sure that the pair status is Simplex Displaying pair information with CQUERY TSO, QUERY ICKDSF You can view pair status and volume information using the CQUERY TSO and the QUERY ICKDSF commands.

  • Page 61: Pprcopy Query

    PPRCOPY QUERY The following table shows the PPRCOPY QUERY command parameters used to display pair information. Table 26 PPRCOPY QUERY parameters Parameters Value Description DDNAME, DDNAME = dname = JCL statement identifying Only one of the three parameters should be SYSNAME, or the volume.
  • Page 62 Table 27 Field descriptions for CQUERY TSO and QUERY ICKDSF command output (continued) Field Description PRIMARY-CCA S-VOL LDEV number PRIMARY-LSS S-VOL CU number PRIMARY-SERIAL S-VOL serial number SECONDARY-SSID SSID of the T-VOL CU SECONDARY-CCA T-VOL LDEV number SECONDARY-LSS T-VOL CU number SECONDARY-SERIAL T-VOL serial number.

  • Page 63: B Business Copy Z Gui Reference

    B Business Copy Z GUI reference This appendix describes the Business Copy Z windows and dialog boxes in Remote Web Console. Pair Operation window The Pair Operation window displays Business Copy Z volume and pair information for volumes associated with the selected CU image. From this window you can perform all Business Copy Z operations.

  • Page 64: Volume List

    Table 28 Menu commands (continued) Field Description Icons Displays all available volumes and is on the upper right of the Pair Operation window. For details, see Volume List. S-VOL T-VOL Reserved volume. In Preview list, this is a preview item. Error.

  • Page 65: Preview List

    Table 29 Volume List (continued) Field Description T-VOL T-VOL information displays in XX:YY:ZZ format. XX:YY:ZZ is the LDKC number:CU number:LDEV number Copy Pace Indicates the speed that data is copied according to the pair status. Slower, Medium, or Faster displays if the pair status is Pending, SP-Pend, V-Split, Resync, or Resync-R.

  • Page 66: Pair Operation Command Menu

    Table 30 Preview List (continued) Field Description CLPR (S) The S-VOL’s cache logical partition displays. CLPR (T) The T-VOL’s cache logical partition displays. Error Code If you click Apply and then the operations in the Preview list fail, an error code indicates the cause of the error.

  • Page 67: History Window

    The filter settings you select are effective in the current session only. They reset when you select another program product to display. Table 32 Display Filter dialog box Field Description CLPR You can specify the cache logical partition (CLPR). Volume Type You can display internal or external volumes.
  • Page 68 NOTE: An S-VOL or T-VOL LDEV number that ends with a pound or gate symbol (#) indicates that the LDEV is an external volume (e.g., 00:00:01 #). You can change the display order by clicking a column title. The list sorts based on the clicked column.

  • Page 69: Option Window

    Table 34 Reference codes (continued) Code Message Description 4760 RESYNC END Resynchronization of pairs ended, and the pair status changed to Duplex. RESYNC-R END 4780 PAIR DELETE The pair was deleted, and the pair status changed to Simplex. 4790 PAIR SUSPEND The pair was suspended, and the pair status changed to Suspend.

  • Page 70: Ctg Command Menu

    Table 35 Fields in the CTG window Field Description CTG Tree Located on the left side of the CTG window. Displays all the consistency groups in layers, regardless of their registrations. Click Subsystem to display all the consistency groups. Click Reserved to display only the reserved consistency groups. Click Free to display only the unreserved consistency groups.
  • Page 71 Table 36 CTG command menu Command Description Add CT Group Use this command to reserve a free consistency group. This command is dimmed if the consistency group is used or reserved. Delete CT Group Use this command to change the status of a reserved consistency group to Free. This command is dimmed if the consistency group is already Free.

  • Page 72: Glossary

    Glossary allocation The ratio of allocated storage capacity versus total capacity as a percentage. Allocated storage refers to those logical devices (LDEVs) that have paths assigned to them. Allocated storage capacity is the sum of the storage of these LDEVs. Total capacity is the sum of the capacity of all LDEVs on the disk array.
  • Page 73 to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to access a single large pool of storage. M-VOL Main volume. Master control unit. OPEN- x A general term describing any one of the supported OPEN emulation modes (for example, OPEN-E.
  • Page 74 Worldwide name. Glossary...

  • Page 75: Index

    Index At-Time Split operation, Option window, Business Continuity Manager, pair creation, Pair Operation command menu, Pair Operation window, Cache Residency, pair operations, calculating maximum number of pairs, and system maintenance;system maintenance and pair command device, ops, Compatible XRC, pair operations workflow, Concurrent Copy, pair status, contacting HP,...
  • Page 76 update copy, volume pairs, volume types, websites HP , HP Subscriber's Choice for Business, product manuals, Index...

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