Silicon Graphics InfiniteStorage 4000 Series, Configuring And Maintaining, Page: 118 / 276

106 Creating a Snapshot Group
Creating a
Snapshot
Group Before you can create any snapshot images you must first create a snapshot group and
the associated repository volume.
To create a new snapshot group use the
create snapGroup
command. This
command creates a new snapshot group that is associated with a specific source
volume. You also create a relationship to a repository volume by one of these
methods:

Use an existing repository volume

Create a new repository volume in a volume group

Create a new repository volume in a disk pool
To create a new repository volume, you identify either an existing volume group or an
existing disk pool and define the size (capacity) for the repository volume. You define
the size by entering either a percentage of the base volume or a specific size that you
want to reserve for the repository volume.
This example shows a basic command in which a new snapshot group is being created
and associated with an existing repository volume:
c:\...\smX\client>smcli 123.45.67.88 123.45.67.89

-c “create snapGroup userLabel=\”Data_Store_1\”

sourceVolume=\"Cont_Dev_04\"

repositoryVolume=\"repos_1234\";”
This command also has these additional parameters:

Setting a repository full policy that defines whether you want to fail writes from
the base volume or to delete (purge) snapshot images.

The priority for rollback operations when you want to restore from the snapshot
images. You can choose the amount of system processing to devote to rollback
that ranges from a minimal impact to host I/O processing to a high impact that
reduces host I/O processing.

Warning limits for when the repository volume is approaching full. The limit is a
percentage of the capacity of the repository volume.

A minimum number of snapshot images that you want to delete if you have
chosen to delete the snapshot images as the method for managing the repository
full policy.

Enabling and defining a schedule for capturing snapshot images.
Deleting a
Snapshot
Group When you delete a snapshot group, the system performs the following actions when a
snapshot group is deleted:

Deletes all existing snapshot images from the snapshot group.

Deletes the associated repository that exists for the snapshot group (if selected).

Disables all the associated snapshot volumes that exist for the deleted snapshot
images.