Dell PowerVault MD3420 - Manual (Page 58)

used with the create snapGroup command allows you to choose to either fail the write attempt or
automatically purge a specified number of older snapshot images.
create snapGroup
userLabel="snapGroupName"
sourceVolume="virtualDiskName"
repositoryVirtualDisk="repos_XXXX"
[repositoryFullPolicy=(failBaseWrites | purgeSnapImages) |
rollbackPriority=(high | highest | medium | low | lowest)|
repositoryFullLimit=percentValue |
autoDeleteLimit=numberOfSnapImages]
• If you attempt to create a snapshot image and either of the two conditions below are present, the
creation might fail:
– The base virtual disk that contains this snapshot image is a member of a Remote Replication
group.
– The base virtual disk is currently synchronizing. When synchronization is complete, the snapshot
image creation will complete.
Creating A Snapshot Image
Before creating a snapshot image, you must have at least one snapshot group into which you can add the
snapshot image.
Create a snapshot image using the following command:
create snapImage (snapGroup="snapGroupName" | snapGroups=("snapGroupName1"...
"snapGroupName2 ..."))
where, snapGroupName or snapGroupNames is the name of the snapshot group (or groups) that you
specify to hold the snapshot image.
NOTE: Ensure that you have either existing repositories, enough free capacity nodes, or available
unconfigured capacity for the storage array on which you are creating the snapshot group
repository.
Deleting A Snapshot Image
Use the delete snapshot image command to delete the oldest snapshot image from a snapshot
group or consistency group.
After a snapshot image is deleted from a snapshot group:
• The snapshot image is deleted from the storage array.
• The repository’s reserve space is released for reuse within the snapshot group.
• All snapshot virtual disks associated with deleted snapshot image are disabled.
Use the following command to delete a snapshot image from a consistency group:
delete snapImage (snapGroup="snapGroupName" | snapGroups=("snapGroupName1"...
"snapGroupNamen")) (deleteCount=numberOfSnapImages |
retainCount=numberOfSnapImages | ignoreSnapVirtualDisk=(TRUE | FALSE) |
snapImageID=OLDEST)
Creating A Consistency Group Snapshot Virtual Disk
Creating a snapshot virtual disk of a consistency group creates a viewable virtual disk of specific images in
the consistency group. A consistency group snapshot virtual disk can be made up of a single base virtual
disk or multiple base virtual disks from the consistency group.
This command also allows you to set the following attributes for the snapshot virtual disk:
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