Veritas Storage Foundation 5.1 SP1 Advanced Features Administrator"s Guide (5900-1503, April 2011)

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

On the master node, 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 150.

Then use the following command to create the snapshot:

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

Note: This step actually takes the snapshot and 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.

Off-host cluster file system backup

Using off-host processing to back up cluster file systems

170