Veritas FlashSnap Point-In-Time Copy Solutions 5.0 AdministratorÆs Guide, HP-UX 11i v3, First Edition, May 2008

43Off-host cluster file system backup

Mounting a file system for shared access

To mount a VxFS file system for shared access, use the following command on

each cluster node where required:

# mount -F vxfs -o cluster /dev/vx/dsk/diskgroup/volume

mount_point

For example, to mount the volume cfs_vol in the disk group exampledg for

shared access on the mount point, /mnt_pnt:

# mount -F vxfs -o cluster /dev/vx/dsk/exampledg/cfs_vol /

mnt_pnt

Using off-host processing to back up cluster file

systems

Note: It is assumed that you have already prepared the volumes containing the

file systems that are to be backed up as described in “Setting up volumes for

instant snapshots” on page 21.

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

1 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, use the procedure described in “Creating a volume

for use as a full-sized instant snapshot” on page 27 to prepare an empty

volume for the snapshot, and 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.