Dell PowerVault MD3260i - Manual (Page 57)

This action frees repository capacity so it can be used to satisfy ongoing copy-on-write requirements for the remaining
snapshot images.
For other values, see
Create Consistency Group .
Deleting A Consistency Group
This command deletes a snapshot consistency group. You can either delete both the consistency group and the
repository virtual disks contained by the consistency group, or you can delete only the consistency group and leave the
repository virtual disks contained in the consistency group intact.
delete consistencyGroup [consistencyGroupName [deleteRepositoryMembers=(TRUE |
FALSE)]]
To delete the consistency group and the repository virtual disks, set the deleteRepositoryMembers parameter to
TRUE. To retain the repository virtual disks, set this parameter to FALSE. The default setting is FALSE.
Once completed, this command:
• Deletes all existing snapshot images and snapshot virtual disks from the consistency group.
• Deletes all the associated snapshot images and snapshot virtual disks for each member virtual disk in the
consistency group.
• Deletes all associated repositories for each member virtual disk in the consistency group (if selected).
Setting Consistency Group Attributes
To change or set the properties for a snapshot consistency group, use the set consistencyGroup command:
set consistencyGroup ["consistencyGroupName"] [userLabel="consistencyGroupName"
| repositoryFullPolicy=(failBaseWrites | purgeSnapImages)|
repositoryFullLimit=percentValue| autoDeleteLimit=numberOfSnapImages|
rollbackPriority=(lowest | low | medium | high | highest)]
The repositoryFullPolicy parameter determines how you want snapshot processing to continue if the snapshot
repository virtual disks are full. You can choose to fail writes to the base virtual disk (failBaseWrites) or delete
(purgeSnapImages) the snapshot images. The default action is to delete the images.
The repositoryFullLimit controls the percentage of repository capacity at which you receive a warning that the
snapshot repository virtual disk is nearing full. Use integer values. autoDeleteLimit configures the automatic
deletion thresholds of snapshot images to keep the total number of snapshot images in the snapshot group at or below a
designated level. When this option is enabled, then any time a new snapshot image is created in the snapshot group, the
system automatically deletes the oldest snapshot image in the group to comply with the limit value. This action frees
repository capacity so it can be used to satisfy ongoing copy-on-write requirements for the remaining snapshot images.
The rollBackPriority parameter sets priority level for a consistency group rollback in an operational storage
array.
For example, use this command on a consistency group named CGGroup_1:
set consistencyGroup ["CGGroup_1"] autoDeleteLimit=6 rollbackPriority=low;
Valid values are highest, high, medium, low, or lowest. The rollback priority defines the amount of system
resources that should be allocated to the rollback operation at the expense of system performance. A value of high
indicates that the rollback operation is prioritized over all other host I/O. Lower values indicate that the rollback
operation should be performed with minimal impact to host I/O.
autoDeleteLimit allows you to configure each snapshot group to perform automatic deletion of its snapshot
images to keep the total number of snapshot images in the snapshot group at or below a maximum number of images.
When the number of snapshot images in the snapshot group is at the maximum limit, the autoDeleteLimit
parameter automatically deletes snapshot images whenever a new snapshot image is created in the snapshot group.
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