Page 5 - Designing a Multi-Site SAN; Requirements; Best practices for implementing the Multi-Site SAN network; Adequate bandwidth
1 Designing a Multi-Site SAN The HP StoreVirtual Multi-Site SAN features enable you to synchronously mirror data between sitesautomatically. You create a Multi-Site SAN by configuring equal numbers of storage systems intosites in the software. The Multi-Site SAN software enables the following featur...
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 fai...
Page 7 - Sample recommended network configurations for Multi-Site SANs; in these illustrations, which focus on the network design.
Sample recommended network configurations for Multi-Site SANs This section provides illustrations of common network configurations for the topologies describedin Table 1 (page 6) . The clusters and sites can have many more storage systems than are depicted in these illustrations, which focus on the ...
Page 8 - Figure 3 Triangular network with Failover Manager
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 8 Designing a Multi-Site SAN
Page 9 - Using multiple subnets; Best practice is to use a single subnet in most cases.
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 - Using multiple cluster VIPs when connecting to a Multi-Site SAN
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 asingl...
Page 12 - Using MPIO with multiple subnets
Figure 9 Target portal value remains Default 8. After setting the values, click OK to close the Advanced Settings dialog. 9. Click OK again to finish logging on. 10. If you want to set the MPIO load balancing policy, see the HP StoreVirtual Storage DSM forMPIO Deployment Guide. 11. If you have multi...
Page 13 - Best practice; ). The one exception to this rule is the two-site configuration in; Sample configurations
In addition to setting up the Multi-Site clusters for data replication, it is important to set up the SANmanagers for quorum correctly to ensure that in the event of a failure the system can be properlyrecovered. Maintaining quorum can be either an automated process or manually recovered by anAdmini...
Page 14 - Figure 12 Three physical sites: cluster spans three sites
Figure 11 Two physical sites, logical third site: cluster spans two sites, Failover Manager in logicalthird site 1. Volumes are configured with Network RAID-10 Figure 12 Three physical sites: cluster spans three sites 1. Volumes are configured with Network RAID-10+1 14 Designing a Multi-Site SAN
Page 16 - describes
Table 3 Common Multi-Site SAN configurations with recommended managers Number of managers and numberNeeded to maintain quorum Manager configuration Multi-Site SAN configuration • Manager count = three Number for quorum = two • Manager count = five Number for quorum = three For four storage systems, ...
Page 17 - Table 4 Data protection levels and the supported number of sites; Setting up application clusters in a Multi-Site SAN environment; Failure modes and recovery steps
Table 4 Data protection levels and the supported number of sites Number of sites supported Data protection level Two Network RAID-10 Three NOTE: Two sites are supported, but not considered a best practice configuration. Network RAID–10+1 Two NOTE: Three sites are supported, but are not considered a ...
Page 18 - Table 5 Failure conditions and resolutions; Alternative setups; lists other possible configurations.
Table 5 Failure conditions and resolutions Resolution steps Failure condition None. The primary site will continue to operate. Secondary site offline None. The primary site will continue to operate. Network link between sites fails Primary site offline 1. If any of the storage systems running manage...
Page 19 - Table 6 Alternative Multi-Site SAN configurations
Table 6 Alternative Multi-Site SAN configurations (continued) Details Description Alternate configuration be Multi-Site if it is to contain storage systemsfrom different subnets. The Virtual Manager is used in two-siteconfigurations, and is not as commonly used The Virtual Manager capabilityremains ...
Page 20 - Before you begin; Preparing to install a new Multi-Site SAN; Installing the 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 fe...
Page 21 - Create a site and then assign storage systems to the site.; Using the Multi-Site cluster wizard; Select
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 ...
Page 22 - Creating sites; Viewing the Multi-Site cluster information; Figure 15 Viewing the sites in the cluster Details tab
Creating sites When creating a new site, you first create the site and then assign storage systems to that site: 1. Click New to open the New Site window. 2. Enter a name for the site and an optional description. 3. [Optional] Make the site primary, if appropriate. 4. Click Add in the Site Systems s...
Page 23 - Figure 16 Viewing the Sites Details tab window; “Preparing to convert an existing SAN; Prerequisites
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 LeftHand OS software version ...
Page 24 - Configuring managers; Overview; “Common configurations of Multi-Site; Fault tolerant manager configurations; Installing and configuring a Failover Manager
10. 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 wantto create a new volume for your Multi-Site cluster, clear the box and fill in the volumeinformation. 11. Click Next to complete the ...
Page 25 - Adding the Failover Manager to the management group and site
Best practice Install the Failover Manager on a server in a separate physical location from the SAN sites, andthen add it as a separate site in the management group. Doing so will prevent loss of quorum ina site failure, regardless of which single site fails. Adding the Failover Manager to the manag...
Page 26 - Viewing sites in the CMC; To view sites in the CMC, select the; Sites map view
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 systemsas unassigned. The site designation has no effect outside of the Multi-Site SAN...
Page 27 - To edit a site; Deleting a site
• Sites • Sites (Grouped) Designating a primary site Use the Primary designation when you are using the Multi-Site cluster to maintain a primary siteand a second site as a backup site. Designate the site as Primary when you create the site, or youcan edit an existing site to make it primary. Only on...
Page 28 - Adding storage systems to a Multi-Site cluster; Adding additional capacity to existing sites; To add capacity
1. Select the Sites node in the navigation window. 2. 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 ...
Page 29 - To remove the storage systems from the site; Removing servers from a site
Removing storage systems from a Multi-Site cluster Removing storage systems from a Multi-Site cluster affects the capacity of the cluster and theMulti-Site configuration. • Ensure that the capacity remaining after you remove the storage system(s) is sufficient for thedata on the volumes. • To mainta...
Page 30 - Contacting HP; Subscription service; Rack stability
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 ...
Page 31 - HP websites; For additional information, see the following HP websites:
initiate a fast and accurate resolution, based on your product’s service level. Notifications may besent to your authorized HP Channel Partner for on-site service, if configured and available in yourcountry. The software is available in two variants: • HP Insight Remote Support Standard: This softwa...
Page 32 - when submitting your feedback.
4 Documentation feedback HP is committed to providing documentation that meets your needs. To help us improve thedocumentation, send any errors, suggestions, or comments to Documentation Feedback( [email protected] ). Include the document title and part number, version number, or the URL when subm...
Page 33 - Glossary
Glossary The following glossary provides definitions of terms used in the LeftHand OS softwareand the HP StoreVirtual Storage. acting primaryvolume The remote volume, when it assumes the role of the primary volume in a failover scenario. Active-Passive A type of network bonding which, in the event o...
Page 39 - Index; Symbols
Index Symbols 2-site configurations primary site designation in, 17 A adding additional capacity to existing sites, 28 site, 27 storage systems to Multi-Site cluster, 28 alternative Multi-Site SAN configurations, 18 application clusters setting up in a Multi-Site SAN environment, 17 application serv...
