HP StorageWorks SAN Virtualization Services Platform Manager User Guide (5697-0454, May 2010)

3. In the Comment field, enter any text you want.
4. Click Next. A confirmation screen appears.
5. Click Finish. The PiT is created, and the group’s tasks start copying the PiT to their destinations.
The PiT appears in the Source Domain’s PiTs tab for the group. You can track the life cycle of
the PiT in the Source & Destination PiTs tab. For more information, see “Async mirror group
information—Source & Destination PiTs tab” on page 276.
Mirroring cluster virtual disks
The mirror service supports synchronous mirroring on virtual disks that are used as cluster resources.
To mirror a virtual disk used as a cluster resource, define the virtual disk as a cluster resource and
configure it in a cluster application before inserting the virtual disk into a sync mirror group. See
“Defining virtual disks as clustered” on page 119 for instructions on how to define a cluster resource
and configure it in a cluster application.
When a cluster of nodes has permission to use a synchronous mirror group, the node that is reserving
the group is indicated by the Reserved field in the Host Presentation tab for the group. Each node
reports the group’s status, and the reported status appears as Mirror Status in the Host Presentation
tab for the group. Note that when a synchronous mirror group is a cluster resource, the implications
of the group’s status are slightly different from a regular sync mirror group.
When mirroring a cluster resource, each virtual disk used by the cluster application is a separate VSM
virtual disk. Therefore:
• Insert each such virtual disk into a separate sync mirror group.
• When recovering from cluster failure, handle the Quorum disk group before the other group(s)
used by the cluster application. If the Quorum group status is Absent or Partial, the Quorum group
is the only group for which the statuses are updated.
• The mirror states of all other cluster objects update only when the Quorum group returns to Normal,
Snap-sync, or Journal status.
See “Troubleshooting cluster virtual disks” on page 312 for a description of each task status and group
status for sync mirror groups used by cluster nodes, and suggested actions you can take when the
status indicates a problem.
Troubleshooting
The following tables suggest possible actions you can take when the status of a task or group indicates
a problem.
Table 128 Possible actions according to task status
Possible actionDescriptionTask status
None required.
The status of the task’s destination
virtual disk is normal and the task
is synchronized with the other tasks
in the group.
Normal
None required.
The task is in the process of syn-
chronizing with the other tasks in
the group.
Snapsync
Using mirroring310