9.5.01 HP P4000 SAN Solution User Guide (AX696-96168, February 2012)

Changing the volume description
1. In the Description field, edit the description.
2. Click OK when you are finished.
Changing the cluster—migrating a volume to a different cluster
Editing the volume to change the cluster causes the volume to migrate to the target cluster. The
SAN/iQ software allows the online migration of volumes between storage clusters in the same
management group. This migration can be used to manage both storage capacity and performance
between clusters. For example, move a large volume from Cluster A to Cluster B to free up space
in Cluster A, or improve the performance of a volume by moving it from a cluster of MDL-SAS
storage systems to a cluster of 15K SAS storage systems.
See Table 44 (page 159) for the requirements for migrating a volume.
iSCSI sessions and volume migration
iSCSI sessions are rebalanced during volume migration. While data is being migrated the volume
is still accessible and fully functional. The rebalancing affects systems using the DSM for MPIO
differently than systems that are not using the DSM for MPIO.
• Using DSM for MPIO—Administrative sessions are rebalanced to the new cluster immediately
upon volume migration. DSM sessions go into an unknown/failed state and are then
re-established on the second cluster within a short period of time.
• No DSM for MPIO—iSCSI session is rebalanced to the new cluster immediately on volume
migration.
As soon as possible after beginning the migration, the iSCSI initiators configured to access this
volume must be re-configured to connect to the VIP of the new cluster. Most initiators require you
to disconnect the volume, re-configure the initiator to use the new cluster VIP as a target address,
and then connect to the volume again. Since this volume is disconnected, administrators should
schedule a maintenance window for the re-configuration of the initiator.
NOTE: Moving the volume to a different cluster requires restriping the data in both clusters.
Restriping can take hours, or even days.
To change the cluster—migrate the volume
1. On the Edit Volume window, select the Advanced tab.
2. In the Cluster drop-down list, select a different cluster.
3. Click OK.
Changing the data protection level
1. In the Data Protection Level drop-down list, select the level of Network RAID you want.
Changing a volume to either Network RAID-5 or Network RAID-6 requires that volume to have
a snapshot schedule. If the volume does not already have a snapshot schedule related to it,
one will be created automatically. This default schedule is named VolumeName_Schedule,
recurs once daily, and retains 1 copy. You can edit this schedule as desired, as described in
“Editing scheduled snapshots” (page 168).
2. Click OK when you are finished.
Changing the size
1. In the Size field, change the number and change the units if necessary.
2. Click OK when you are finished.
CAUTION: Decreasing the volume size is not recommended. If you shrink the volume in the CMC
before shrinking it from the server file system, your data will be corrupted or lost.
160 Using volumes