HP StorageWorks SAN Virtualization Services Platform Best Practices Guide (5697-0935, May 2011)

a. Failover the SVSP virtual disks to one DPM (right-click the DPM, and select failover all).
NOTE: Ensure all application servers have MPIO installed. Otherwise they will lose
access to their virtual disks.
b. Verify that the DPM does not have any active virtual disks.
c. Reboot the DPM.
d. When the DPM is online, use PuTTY or Telnet and run show debug agentstate to
verify that all paths to the back-end LUs display an OK status.
e. Repeat steps a through d for the other DPMs.
5. Re-create the pool according to the new design (stripe sets first, then the pool from the stripe
sets).
Migrate to the destination site pool
1. Migrate the virtual disks from the second site (the one where you just migrated virtual disks)
to the first site pool that has the new design.
• Ensure that you have at least 20% of the largest virtual disk free in the source pool,
otherwise migration will not be possible. You might need to temporarily add an additional
back-end LU to the pool.
• HP recommends adding prefixes to the names of groups, tasks, and virtual disks. For
example, -g_ for groups, -t_ for tasks, and -a_ for auxiliary virtual disks (the auxiliary
virtual disks will be deleted afterwards). A group example may be -g_host1Database1.
2. Once all migration groups are finished (they are automatically deleted once they are complete),
verify that all migrated virtual disks are in the new pool and have host presentation.
3. Verify that all virtual disks in the second site pool (the migration source site) have the auxiliary
name (with host presentation = none).
Re-create synchronous mirror groups
1. Delete auxiliary virtual disks to create source pool capacity (be careful because SVSP does
not check if virtual disks have host presentation). Make sure you delete auxiliary virtual disks
only.
2. Create synchronous mirror groups on the source virtual disks as a first task.
3. Create a second task (right-click synchronous mirror disk, select Add Task, and so on).
NOTE: Ensure that you have enough free space in the source pool. If necessary, either
reduce the free pool threshhold or add a temporary back-end LU.
4. Verify that all synchronous mirror groups have a status of SnapSync and show progress.
Striped pooling with EVAx400 arrays
Use the following figure and description below as the basis for using striped pooling with an HP
EVAx400.
Migrating an existing synchronous mirror group 45