Hardware manual

Group Administration Advanced volume operations
10–8
thin clone before you need to increase its size. This value is the same as the value for “unreserved” space in the
Volume Space table in the Volume Status window for the template volume.
If you detach a thin clone, the resulting new standard volume has in-use
space equal to the combined shared space
and unshared space, as shown in the Shared Space table in the Volume Status window.
Restrictions on template volumes and thin clones
With a few exceptions, all normal volume attributes and operations apply to template volumes and thin clones as
specified in Table 10-1.
Table 10-1: Template Volume and Thin Clone Restrictions
Attribute or
Operation
Restriction
Snapshots You cannot restore a template volume from a snapshot.
Thin provisioning You cannot disable thin provisioning on a template volume or thin clone.
Permissions You cannot set Template volumes to read-write permission.
Volume collections You cannot include a template volume in a volume collection.
Scheduling operations You cannot schedule a snapshot or replication operation for a template volume.
RAID preference Thin clones inherit the RAID preference,
if
any, of the template volume.
Member binding Thin clones inherit the member binding setting, if any, of the template volume.
Cloning Cloning a template volume creates a new template volume with a new name and iSCSI target, but
th
e sam
e reported size, pool, and contents as the original volume at the time of the cloning.
Cloning a thin clone creates a new t
hin clone with a new name and iSCSI target, but the same
reported size, pool, contents, and relationship to the template volume as the original thin clone at the
time of the cloning.
Resizing You cannot change the reported size of a template volume. However, you can change the thin
provisioni
ng settings.
Pool move Thin clones inherit the pool setting of the template volume. If you move the template volume to a
different
pool, the thin clones also move.
Replication You can replicate a template volume only one time.
You cannot replicate a thin clone until you replicate the template volume to which the thin clone is
attached.
Failover You can permanently promote a template replica set to a template volume only if you first
perman
ently p
romote all the attached thin clone replica sets to thin clones.
Failback You cannot demote a template volume to a failback replica set.
You cannot fail back a template volume.
To fail back a thin clone volume, the template volume must exist on the primary group.
Deletion You cannot delete a template volume if it has thin clones or failb
ack thin clone replica sets attached
to it.
You cannot delete a recovery template volume if there are still recovery thin clone volumes, thin
clone replica sets, or permanently pr
omoted thin clone replica sets attached to the volume.
Converting a standard volume to a template volume
When you convert a standard volume to a template volume, the template volume is thin provisioned, read-only, and
offline. You can set the volume online at any time.