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HP StoreVirtual 4000 Configuration Manual

Lefthand storage multi-site configuration guide
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HP LeftHand Storage Multi-Site Configuration
Guide
Abstract
This guide contains detailed instructions for designing and implementing the Multi-Site SAN features of HP LeftHand Storage.
The Multi-Site SAN features enable you to synchronously and automatically mirror data between geographic sites. Topics
include designs for network configurations and instructions about implementing the network designs. The intended audience
is system administrators who manage HP LeftHand Storage solutions.
For the latest version of this guide, see the HP website http://www.hp.com/support/LeftHandManuals.
HP Part Number: AX696-96187
Published: November 2012
Edition: 6

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Summary of Contents for HP StoreVirtual 4000

  • Page 1 HP LeftHand Storage Multi-Site Configuration Guide Abstract This guide contains detailed instructions for designing and implementing the Multi-Site SAN features of HP LeftHand Storage. The Multi-Site SAN features enable you to synchronously and automatically mirror data between geographic sites. Topics include designs for network configurations and instructions about implementing the network designs.
  • Page 2 © Copyright 2009, 2012 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 Designing a Multi-Site SAN.................5 Designing the network for the Multi-Site SAN................5 Best practices for implementing the Multi-Site SAN network............5 Common Multi-Site SAN network designs................6 Sample recommended network configurations for Multi-Site SANs..........7 Using multiple subnets ......................9 Connecting volumes to multiple subnets in a Multi-Site SAN using the Microsoft iSCSI initiator........................10 Using multiple cluster VIPs when connecting to a Multi-Site SAN..........10 Connecting application servers with single or multiple NICs to a Multi-Site SAN ....10...
  • Page 4 To add capacity......................28 Removing storage systems from a Multi-Site cluster...............29 To remove the storage systems from the site................29 Removing servers from a site....................29 3 Support and other resources..............30 Contacting HP........................30 Subscription service......................30 Rack stability..........................30 Customer self repair........................30 HP Insight Remote Support Software..................30 Related information.........................31 HP websites........................31 4 Documentation feedback................32...

  • Page 5: Designing A Multi-Site San

    1 Designing a Multi-Site SAN The HP LeftHand Multi-Site SAN features enable you to synchronously mirror data between sites automatically. You create a Multi-Site SAN by configuring equal numbers of storage systems into sites in the software. The Multi-Site SAN software enables the following features: Multi-Site clusters that can: ◦...

  • Page 6: Common Multi-Site San Network Designs

    Low round-trip latency—In order to not impact disk I/O to the application server, the round-trip latency between the sites must be no more than 2 ms. Redundant links—Have multiple physical connections (media) between the sites for redundancy. The network should be configured so that a link failure does not cause the Multi-Site SAN to go offline.

  • Page 7: Sample Recommended Network Configurations For Multi-Site Sans

    Sample recommended network configurations for Multi-Site SANs This section provides illustrations of common network configurations for the topologies described Table 1 (page 6). The clusters and sites can have many more storage systems than are depicted in these illustrations, which focus on the network design. Figure 1 Dual redundant links between two sites 1.
  • Page 8 Figure 3 Triangular network with Failover Manager 1. Dual redundant GigE links Figure 4 Hub and spoke network core with redundant links out to each site 1. Core network hub and spoke Designing a Multi-Site SAN...

  • Page 9: Using Multiple Subnets

    Figure 5 Combination full-mesh core with triangular links to all sites 1. Full mesh core network Using multiple subnets IMPORTANT: Best practice is to use a single subnet in most cases. You can use multiple subnets with a Multi-Site SAN. Multiple subnets let you have multiple VIPs, one VIP per subnet.

  • Page 10: Connecting Volumes To Multiple Subnets In A Multi-Site San Using The Microsoft Iscsi Initiator

    Figure 6 Multi-Site SAN mapping to subnets, VIPs, and application servers 1. Dual redundant GigE links Connecting volumes to multiple subnets in a Multi-Site SAN using the Microsoft iSCSI initiator Connecting to volumes in a multiple subnet configuration is similar to connecting to volumes in a single-site configuration, with the following important differences: You must configure all cluster VIPs for discovery, for proper failover/failback configuration of a Multi-Site SAN.
  • Page 11 Figure 7 Entering VIPs in a Multi-Site SAN configuration On the Targets tab, select the volume to log on to. Click Log On. Select the Enable multi-path check box if using MPIO. Figure 8 Logging on to volume [Optional] If you want this volume to be available after rebooting, select the Automatically restore...

  • Page 12: Using Mpio With Multiple Subnets

    Figure 9 Target portal value remains Default After setting the values, click OK to close the Advanced Settings dialog. Click OK again to finish logging on. If you want to set the MPIO load balancing policy, see the HP LeftHand Storage DSM for MPIO Deployment Guide.

  • Page 13: Best Practice

    In addition to setting up the Multi-Site clusters for data replication, it is important to set up the SAN managers for quorum correctly to ensure that in the event of a failure the system can be properly recovered. Maintaining quorum can be either an automated process or manually recovered by an Administrator.
  • Page 14 Figure 1 1 Two physical sites, logical third site: cluster spans two sites, Failover Manager in logical third site 1. Volumes are configured with Network RAID- 1 0 Figure 12 Three physical sites: cluster spans three sites 1. Volumes are configured with Network RAID- 1 0+1 Designing a Multi-Site SAN...

  • Page 15: Best Practices For Configuring Quorum And Managers In A Multi-Site San Environment

    Figure 13 Two physical sites: cluster spans two sites, one site is the primary site 1. Volumes are configured with Network RAID- 1 0 Best practices for configuring quorum and managers in a Multi-Site SAN environment Configuring the appropriate number of managers in a Multi-Site SAN on the appropriate storage systems is an important part of setting up the Multi-Site SAN for high availability and fault tolerance.

  • Page 16: Configuring Data Replication For Optimal Availability And Redundancy

    Table 3 Common Multi-Site SAN configurations with recommended managers Multi-Site SAN configuration Manager configuration Number of managers and number Needed to maintain quorum Two physical sites, one site is primary For four storage systems, run: Manager count = three Two managers in the primary site Number for quorum = two One manager in the secondary site Manager count = five...

  • Page 17: Using Network Raid- 1 0+2

    Table 4 Data protection levels and the supported number of sites Data protection level Number of sites supported Network RAID- 1 0 Network RAID–10+1 Three NOTE: Two sites are supported, but not considered a best practice configuration. Network RAID–10+2 NOTE: Three sites are supported, but are not considered a best practice configuration.

  • Page 18: Alternative Setups

    Table 5 Failure conditions and resolutions Failure condition Resolution steps Secondary site offline None. The primary site will continue to operate. Network link between sites fails None. The primary site will continue to operate. Primary site offline If any of the storage systems running managers in the primary site can be brought back online, you should do this first.
  • Page 19 Table 6 Alternative Multi-Site SAN configurations (continued) Alternate configuration Description Details be Multi-Site if it is to contain storage systems from different subnets. Using Virtual Manager The Virtual Manager capability The Virtual Manager is used in two-site remains in the product (a manual configurations, and is not as commonly used IMPORTANT: This is not a best...

  • Page 20: Implementing A Multi-Site San

    2 Implementing a Multi-Site SAN After you have designed the Multi-Site SAN configuration, you are ready to implement it. Before you begin Install Multi-Site SAN feature keys on the storage systems you are going to use. Register your storage systems. For more information, see “Registering Advanced Features” in the HP LeftHand Storage User Guide for information about registering your storage systems.

  • Page 21: Creating The Management Group

    Figure 14 Using the management group wizard to create a Multi-Site SAN NOTE: You must have at least one storage system for each site in the Available Systems pool before starting. Creating the management group The first part of the wizard creates the management group, which includes configuring the optimal number of managers for the initial setup.

  • Page 22: Creating Sites

    Creating sites When creating a new site, you first create the site and then assign storage systems to that site: Click New to open the New Site window. Enter a name for the site and an optional description. [Optional] Make the site primary, if appropriate. Click Add in the Site Systems section and then select the storage systems for this site.

  • Page 23: Converting An Existing San To A Multi-Site San

    Figure 16 Viewing the Sites Details tab window Converting an existing SAN to a Multi-Site SAN Plan the conversion according to the criteria described in “Preparing to convert an existing SAN to a Multi-Site SAN” (page 20). Prerequisites Upgrade all storage systems to SAN/iQ software version 7.0 or later. Obtain the feature keys for storage systems to be used in the Multi-Site cluster.

  • Page 24: Configuring Managers

    Assign one or more VIPs as planned for your site layout, and then click Next. The Create Volume window opens with the Skip Volume Creation box checked. If you want to create a new volume for your Multi-Site cluster, clear the box and fill in the volume information.

  • Page 25: Best Practice

    Best practice Install the Failover Manager on a server in a separate physical location from the SAN sites, and then add it as a separate site in the management group. Doing so will prevent loss of quorum in a site failure, regardless of which single site fails. Adding the Failover Manager to the management group and site Adding the Failover Manager to the management group will likely cause the manager configuration to become less than optimal.

  • Page 26: Viewing Sites In The Cmc

    Viewing sites in the CMC To view sites in the CMC, select the Sites node in the navigation window. The Sites node is displayed in every management group. Typically, however, the Sites Details tab shows the storage systems as unassigned. The site designation has no effect outside of the Multi-Site SAN configuration. Figure 17 No sites in a standard cluster When there is a Multi-Site cluster in the management group, the Sites Details tab shows the site assignments of the storage systems and servers.

  • Page 27: Designating A Primary Site

    Sites Sites (Grouped) Designating a primary site Use the Primary designation when you are using the Multi-Site cluster to maintain a primary site and a second site as a backup site. Designate the site as Primary when you create the site, or you can edit an existing site to make it primary.

  • Page 28: Adding Storage Systems To A Multi-Site Cluster

    Select the Sites node in the navigation window. Select the site you want to delete in the Details tab, right-click, and then select Delete Site. NOTE: If only one site will be left in the cluster, the warning shown in “Deleting a site that contains a storage system causes this warning”...

  • Page 29: Removing Storage Systems From A Multi-Site Cluster

    Removing storage systems from a Multi-Site cluster Removing storage systems from a Multi-Site cluster affects the capacity of the cluster and the Multi-Site configuration. Ensure that the capacity remaining after you remove the storage system(s) is sufficient for the data on the volumes. To maintain the Multi-Site configuration, plan to remove equal numbers of storage systems from each site.

  • Page 30: Support And Other Resources

    3 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 31: Related Information

    initiate a fast and accurate resolution, based on your product’s service level. Notifications may be sent to your authorized HP Channel Partner for on-site service, if configured and available in your country. The software is available in two variants: HP Insight Remote Support Standard: This software supports server and storage devices and is optimized for environments with 1-50 servers.

  • Page 32: Documentation Feedback

    4 Documentation feedback HP is committed to providing documentation that meets your needs. To help us improve the documentation, send any errors, suggestions, or comments to Documentation Feedback (docsfeedback@hp.com). Include the document title and part number, version number, or the URL when submitting your feedback.

  • Page 33: Glossary

    Glossary The following glossary provides definitions of terms used in the SAN/iQ software and the HP P4000 SAN Solution. acting primary The remote volume, when it assumes the role of the primary volume in a failover scenario. volume Active-Passive A type of network bonding which, in the event of a NIC failure, causes the logical interface to use another NIC in the bond until the preferred NIC resumes operation.
  • Page 34 Device Specific Module. DSM for MPIO The HP P4000 DSM for MPIO vendor-specific DSM that interfaces with the Microsoft MPIO framework. failback After failover, the process by which you restore the primary volume and turn the acting primary back into a remote volume. failover The process by which the user transfers operation of the application server over to the remote volume.
  • Page 35 Multi-Site cluster A cluster of storage that spans multiple sites (up to three). A Multi-Site cluster must meet at least one of the following conditions: Contain storage systems that reside in two or more sites Contain storage systems that span subnets Contain multiple VIPs.
  • Page 36 RAID status Condition of RAID on the storage system: Normal - RAID is synchronized and running. No action is required. Rebuild - A new disk has been inserted in a drive bay and RAID is currently rebuilding. No action is required. Degraded - RAID is not functioning properly.
  • Page 37 shared snapshot Shared snapshots occur when a clone point is created from a newer snapshot that has older snapshots below it in the tree. All the volumes created from the clone point will display these older snapshots that they share, as well as the clone point. site A user-designated location in which storage systems are installed.
  • Page 38 volume set Two or more volumes used by an application. For example, you may set up Exchange to use two volumes to support a StorageGroup: one for mailbox data and one for logs. Those two volumes make a volume set. volume size The size of the virtual device communicated to the operating system and the applications.

  • Page 39: Index

    Index network for Multi-Site SAN, Symbols document 2-site configurations related information, primary site designation in, documentation HP website, providing feedback on, adding additional capacity to existing sites, site, editing a site, storage systems to Multi-Site cluster, alternative Multi-Site SAN configurations, application clusters Failover Manager setting up in a Multi-Site SAN environment,...
  • Page 40 MPIO and multiple subnets, assigning to sites, Multi-Site cluster removing from a site, creating, setting up removing storage systems from, application clusters in a Multi-Site SAN environment, wizard, Multi-Site SAN MPIO with multiple subnets, alternative configurations, multiple subnets for a Multi-Site SAN, common configurations with recommended Failover sites Manager,...

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