Veritas FlashSnap Point-In-Time Copy Solutions 5.0.1 Administrators Guide, HP-UX 11i v3, First Edition, November 2009

To back up a snapshot of a mounted file system which has shared access

On the master node of the cluster, use the following command to make a

full-sized snapshot, snapvol, of the volume containing the file system by

breaking off plexes from the original volume:

# vxsnap -g volumedg make \

source=volume/newvol=snapvol/nmirror=N

The nmirror attribute specifies the number of mirrors, N, in the snapshot

volume.

For example, to take a snapshot of the volume cfs_vol in the shared disk

group exampledg:

# vxsnap -g exampledg make source=cfs_vol/newvol=scfs_vol\

/nmirror=1

If the volume does not have any available plexes, or its layout does not support

plex break-off, prepare an empty volume for the snapshot.

See “Creating a volume for use as a full-sized instant snapshot” on page 35.

Then use the following command to create the snapshot:

# vxsnap -g volumedg make source=volume/snapvol=snapvol

Note: This step sets up the snapshot volumes ready for the backup cycle, and

starts tracking changes to the original volumes.

When you are ready to make a backup, proceed to step 2.

On the master node, refresh the contents of the snapshot volumes from the

original volume using the following command:

# vxsnap -g volumedg refresh snapvol source=vol \

[snapvol2 source=vol2]... syncing=yes

The syncing=yes attribute starts a synchronization of the snapshot in the

background.

For example, to refresh the snapshot scfs_vol:

# vxsnap -g exampledg refresh scfs_vol source=cfs_vol \

syncing=yes

Off-host cluster file system backup

Using off-host processing to back up cluster file systems