HP P6000 Replication Solutions Manager Administrator Guide (T3680-96069, June 2012)

Snapclones cannot be created when the disk to be replicated is:
• A snapshot
• A disk that has a snapshot or mirrorclone
• In the process of normalizing (snapclone in progress) or being deleted
Mirrorclones
Mirrorclone replication establishes and maintains a copy of an original virtual disk via a local
replication 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 the source virtual disk is updated. When local replication between a synchronized
mirrorclone and its source is stopped by an action or command, the mirrorclone is said to be
fractured. In a fractured state, the mirrorclone is not updated when the source virtual disk is updated.
At the instant replication is stopped, the mirrorclone is a point-in-time copy of its source.
This feature is only available with certain controller software versions.
Mirrorclone guidelines
Follow these guidelines for using mirrorclones:
• 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 array. Mirrorclones with a high amount of resynchronized
data can affect array performance.
NOTE: See the HP P6000 Replication Solutions Manager Release Notes for additional information.
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
12 Replication manager overview