Dell PowerVault MD3260i - Manual (Page 181)

• 32 MB to support fixed overhead for the snapshot group and for copy-on-write processing.
• Capacity for rollback processing, which is 1/5000th of the capacity of the base virtual disk.
The minimum capacity is enforcement by the RAID controller module firmware and the MD storage management
software.
When a you first create a snapshot group, it does not contains any snapshot images. When you create snapshot images,
you add the snapshot images to a snapshot group. Use the create snapImage command to create snapshot
images and add the snapshot images to a snapshot group.
A snapshot group can have one of these states:
Optimal The snapshot group is operating normally.
Full The snapshot group repository is full. Additional copy-on-write operations can not be
performed. This state is possible only for snapshot groups that have the Repository Full policy
set to Fail Base Writes. Any snapshot group in a Full state causes a Needs-Attention condition
to be posted for the storage array.
Over Threshold The snapshot group repository virtual disk usage is at or beyond its alert threshold. Any
snapshot group in this state causes a Needs-Attention condition to be posted for the storage
array.
Failed The snapshot group has encountered a problem that has made all snapshot images in the
snapshot group unusable. For example, certain types of repository virtual disk failures can
cause a Failed state. To recover from a Failed state use the revive snapGroup command.
Create Snapshot Image
Description
This command creates a new snapshot image in one or more existing snapshot groups. Before you can create a
snapshot image, you must first have at least one snapshot group into which you can place the snapshot image. To
create a snapshot group use the create snapGroup command.
Syntax
create snapImage (snapGroup="snapGroupName" |
snapGroups=("snapGroupName1"... "snapGroupName2"))
Parameters
Parameter Description
snapGroup or snapGroups The name of the snapshot group that will contain the
snapshot image. Enclose the name of the snapshot group
in double quotation marks (" ").
If you enter more than one snapshot group name, enclose
each of the snapshot group names in double quotation
marks (" "). Enclose all of the snapshot group names in
parenthesizes.
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