Mirrorclone Faq; Mirrorclone Guidelines - HP 418800-B21 - StorageWorks Modular Smart Array 70 Storage Enclosure User Manual

• 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 can only have the same or lower redundancy level as its source.)
• Optimization. To optimize cost and performance, a can mirrorclone have a different type of
physical disks than its source.
The mirrorclone feature is controller software version dependent. See
controller software features - local

Mirrorclone FAQ

• How can I tell a mirrorclone from other types of virtual disks?
Because mirrorclones 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 terms
When a mirrorclone is in a synchronized state, the local 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 source are not replicated to the mirrorclone. See
fractured mirrorclones.
• When can a host read from or write to a mirrorclone?
Hosts can read 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 multiple mirrorclones of a virtual disk?
No. See mirrorclone guidelines.
• What is the maximum number of mirrorclones on a storage system?
There is no limit.
• Can I create a mirrorclone of a mirrorclone?
No.
Can I create snapclones of a mirrorclone?
•
No.
• Can I create snapshots of a mirrorclone?
Yes.
• Can I create 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
• 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
• 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:
144
Host volumes
replication.
synchronized fractured
and
(Vraid).
refer to?
synchronized mirrorclones
replication licenses
and
overview.