HP StorageWorks XP Cluster Extension Software Administrator Guide (T1656-96035, April 2010)

CAUTION:
Failure to delete the monitored device group from the list of monitored device groups can cause data
corruption if the ResyncMonitorAutoRecover attribute is set to YES.
When deleting resources:
• For Windows Server 2008/2008 R2, use the GUI or CLI.
• For Server Core or Hyper-V Server, use the CLI or the MMC.
• For Windows Server 2003, use the GUI or CLI.
For more information on deleting resources, see your Microsoft documentation.
Using Hyper-V Live Migration with XP Cluster Extension
Live migration is a managed failover of VM resources. Live migration should be performed when all
of the solution constituents are in a healthy state, all the servers and systems are running, and all the
links are up. Ensure that the underlying infrastructure is in a healthy state before performing live
migration.
XP Cluster Extension has the capability of discovering unfavorable storage-level conditions for
performing live migration. In response to these conditions, XP Cluster Extension will stop or cancel
the live migration process and inform the user. This is accomplished with no VM downtime. For
example, if live migration is initiated while VM data residing on the storage arrays is still merging
and not in sync, XP Cluster Extension will proactively cancel the live migration and inform the user to
wait until the merge is in progress. Without this feature, live migration might fail or the VM might
come online in the remote data center with inconsistent data.
The XP Cluster Extension StatusRefreshInterval property, which you can configure in a UCF for each
application, specifies the time interval between consecutive array status gathering operations before
the live migration to the target cluster node occurs. By adjusting this property, you can increase the
probability of getting the correct XP array status to ensure a successful live migration. The default
StatusRefreshInterval value is 300 seconds. For more information about configuring this property, see
“Setting XP Cluster Extension properties using a UCF” on page 64.
XP Cluster Extension cancels live migration operations within the local data center when the device
group is not in PAIR status. Use the LocalDCLMForNonPAIRDG property, which can be configured in
a UCF for each application, to change the setting to allow live migration to occur within the local
data center even if the device group is not in PAIR status.
Hyper-V Live Migration is supported with XP Cluster Extension for Windows Server 2008 R2 using
only the synchronous fence levels DATA and NEVER. The asynchronous and journal fence levels are
not supported.
Using Hyper-V Live Migration with Cluster Shared Volumes is not supported with XP Cluster Extension.
TIP:
For more information about using Hyper-V Live Migration with XP, see the white paper Live Migration
across data centers and disaster tolerant virtualization architecture with HP StorageWorks Cluster
Extension and Microsoft Hyper-VTM on the white papers website: www.hp.com/storage/whitepapers.
XP Cluster Extension Software Administrator Guide 71