HP P6000 Replication Solutions Manager User Guide (T3680-96089, October 2012)

Fracture for disk group failure
In the unusual event that a source virtual disk with a mirrorclone experiences a disk group failure,
the mirrorclone is automatically fractured by the array. After the failure is corrected, the source
can be restored from the fractured mirrorclone.
The mirrorclone feature is controller software version dependent. See Controller software features
- local replication.
Mirrorclones - synchronized
Mirrorclone replication establishes and maintains a copy of an original virtual disk, via a local
replication link. See virtual disk Types.
mirrorclone===========>source
(synchronized)local link
When first created (and whenever resynchronized by an action or command), a mirrorclone is
said to be synchronized. In a synchronized state, the mirrorclone is automatically updated whenever
its source virtual disk is updated. See also mirrorclone states and Fractured mirrorclones.
Task summary for synchronized mirrorclones
Synchronized mirrorclones
No. The disk must be first detached, then deleted.Deleting
No. The disk must first be fractured, then detached.Detaching
Yes.Fracturing
No.Presenting
No. Snapclones of mirrorclones are not supported.Replicating - snapclones
No. The disk must first be fractured, then replicated.Replicating - snapshots
No. The disk must first be fractured, then used to restore.Restoring
Not applicable.Resynchronizing
Yes.Swapping
See also general Mirrorclone guidelines and Mirrorclone FAQ.
Benefits of separate disk groups
Mirrorclones created in a separate disk group than their source provide the following benefits:
• Hardware protection. Compared to a snapshot, a mirrorclone is more hardware protected.
(A snapshot must be in the same disk group as its source.)
• Redundancy levels (Vraid). Compared to a snapshot, a mirrorclone can have higher redundancy
levels. (A snapshot must have the same or lower redundancy level as its source.)
• Optimization. To optimize cost and performance, a mirrorclone can have a different type of
physical disks than its source.
The mirrorclone feature is controller software version dependent. See Controller software features
- local replication.
264 Virtual disks