Dell PowerVault MD3420 - Manual (Page 62)

Creating A Snapshot Group
A snapshot group is a sequence of point-in-time images of a single associated base virtual disk. A
snapshot group uses a repository to save data for all snapshot images contained in the group. The
repository is created at the same time the snapshot group is created.
Guidelines when creating a snapshot group:
• When a base virtual disk that contains a snapshot group is added to an asynchronous remote
replication group, the system automatically changes the repository full policy to automatically purge
the oldest snapshot image and sets the auto-delete limit to the maximum allowable snapshot limit for
a snapshot group.
• If the base virtual disk resides on a standard disk group, the repository members for any associated
snapshot group can reside on either a standard disk group or a disk pool. If a base virtual disk resides
on a disk pool, all repository members for any associated snapshot group must reside on the same
disk pool as the base virtual disk.
• You cannot create a snapshot group on a failed virtual disk.
• If you attempt to create a snapshot image, that snapshot image creation operation might remain in a
Pending state because of the following conditions:
– The base virtual disk that contains this snapshot image is a member of an asynchronous remote
replication group.
– The base virtual disk is currently in a synchronizing operation. The snapshot image creation
completes as soon as the synchronization operation is complete.
To create a snapshot group:
create snapGroup userLabel="snapGroupName" sourcevolume="virtualDiskName"
(repositoryVirtualDisk="repos_xxxx" | repositoryVirtualDisk=(diskGroupName
[capacity=capacityValue]) repositoryVirtualDisk=(diskPoolName
[capacity=capacityValue])) [repositoryFullPolicy=(failBaseWrites |
purgeSnapImages) | rollbackPriority=(highest | high | medium | low | lowest) |
repositoryFullLimit=percentValue | autoDeleteLimit=numberOfSnapImages |
enableSchedule=(TRUE | FALSE) schedule=(immediate | snapshotSchedule)]
Deleting A Snapshot Group
CAUTION: All of the data in the snapshot group is lost as soon as you run this command.
This command deletes an entire snapshot group and, if specified, the associated repository virtual disks.
delete snapGroup ["snapGroupName"] deleteRepositoryMembers=TRUE;
In the example, the repository virtual disks were preserved . By default, all member virtual disks in the
repository virtual disk are retained as unused, unmapped standard virtual disks. Setting the
deleteRepositoryMembers parameter to FALSE will delete the repository disks.
Reviving A Snapshot Group
If a snapshot group is not in a Failed state, it can be forced into an Optimal state. Running this command
on a Failed snapshot will return an error message and the command will not complete.
revive snapGroup ["snapGroupName"];
where snapGroupName is the name of the snapshot group you want to force into an Optimal state.
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