HP P6000 Replication Solutions Manager CLI Reference (T3680-96071, June 2012)

• All snapshots of the same virtual disk must be the same type (demand allocated or fully
allocated) and redundancy (Vraid) level.
• If the disk group has insufficient space to increase the capacity of snapshots, the snapshots
will automatically be invalidated, but the source virtual disks will continue accepting requests.
• Snapshots are included in the maximum number of virtual disks per array.
Snapshots cannot be created when the disk to be replicated is:
• A snapshot
• A disk that is the source of a mirrorclone (however, snapshots of a mirrorclone are possible)
• In the process of normalizing (snapclone in progress) or being deleted
• A thin-provisioned virtual disk
Mirrorclone guidelines
• The array must have an HP P6000 Business Copy license installed.
• A mirrorclone can be in a different disk group than the source. For better protection from
hardware failures, HP recommends creating a mirrorclone in a different disk group than the
source (by default, a mirrorclone is created in the same disk group as its source).
• A mirrorclone delta restore may be made when the mirrorclone source is also the source for
a DR group.
• The redundancy (Vraid) level of a mirrorclone can be the same, lower, or higher than the
source.
• The maximum number of mirrorclones per source is one.
• A detached mirrorclone cannot be reattached to its source.
• A mirrorclone may be created on a member of a DR group on the source or destination array.
However, a mirrorclone cannot be a member of a DR group.
• A mirrorclone can be presented only if the mirror link is stopped (fractured).
• You can create, fracture, resync, and detach a mirrorclone of a DR group member.
• You cannot migrate a mirrorclone of a DR group member.
• Consider the performance of your EVA. Mirrorclones with a high amount of resynchronized
data can affect EVA performance.
NOTE: For more information, see the HP P6000 Replication Solutions Manager Release Notes.
A mirrorclone cannot be created if the intended source virtual disk:
• Is a snapshot or has any snapshots
• Has any snapclones that are in the process of being normalized
• Is a thin-provisioned virtual disk
DR group guidelines
• Source and destination arrays must have remote replication licenses.
• The maximum number of virtual disks in a DR group and the maximum number of DR groups
per array vary with controller software versions. For specifics, see HP P6000 Enterprise Virtual
Array Compatibility Reference.
• All virtual disks that contain the data for a common application must be in a common DR
group. HP recommends one application per DR group.
• DR groups can contain members from multiple disk groups.
Replication guidelines 9