• H ardware protection. Compared to a snapshot, a mirrorclone is more hardware protected. (A
snapshotmustbeinthesamediskgroupasitssource.)
• Redundancy levels (Vraid). Compared to a snapshot, a mirrorclone can have higher redundancy
levels. (A snapshot can only have the same or lower redundancy level as its source.)
• O ptimization. Tooptimizecostandperformance,acanmirrorclonehaveadifferenttypeof
physical disks than its source.
The mirrorclone feature is controller software version dependent. See
controller software features - local replication.
Mirrorclone F
AQ
• How can I tell a mirrorclon e from other types of virtual disks?
Because mirr
orclones are not independent virtual disks, they are identified differently than original
(independent) virtual disks. See virtual disk types.
• How long does it take to create a mirrorclone?
A mirrorclone requires only a matter of seconds to create .
• What do the te
rms
synchronized
and
fractured
refer to?
When a mirrorclone is in a synchronized state, the loc al replication link to its source is active.
Changes to data on the source are automatically replicated to the mirrorclone. When a
mirrorclone is in a fractured state, the local replication link is inactive. Changes to data
on the sourc
earenotreplicatedtothemirrorclone. Seesynchronize d mirrorclones and
fractured mirrorclones.
• When can a host read from or write to a m irrorclone?
Hosts can re
ad from and write to fractured mirrorclones but not synchronized mirrorclones.
• After I create a mirrorclone, can I delete the source virtual disk?
No.
• Can I make m
ultiple mirrorclones of a virtual disk?
No. See mirrorclone guidelines.
• What is t h e maximum number of mirrorclones on a storage system?
There is no
limit .
• Can I create a mirrorclone of a mirrorclone?
No.
• Can I creat
e snapclones of a mirrorclone?
No.
• Can I create snapshots of a mirrorclone?
Yes.
• Can I c reate mirrorclones of virtual disks that are in DR groups?
Yes, but only with specific versions of controller software. See
controller software features - local replication
Mirrorclone guidelines
The following general guidelines apply:
• The array must have a local replication license. See replication licenses overvie w.
• A mirrorclone can be in a different disk group than its source. For optimum protection from
hardware failures, HP recommends creating a mirrorclone in a different disk group than its source.
(A mirrorclone is created in the same disk group as its source, unless specified otherwise.)
• The redundancy (Vraid) level of a mirrorclone can be the same, lower, or higher than its source.
See redundancy level (Vraid).
• The maximum number of mirrorclones per source is one.
• Neither the source disk or its mirrorclone can be a member of a DR group.
• A detached mirrorclone cannot be reattached to its source.
A mirrorclone cannot be created if the intended source virtual disk is:
14 4
Host volumes