VERITAS FlashSnap Point-In-Time-Copy Solutions Administrator's Guide

Chapter 4, Off-Host Cluster File System Backup

Using Off-Host Processing to Back Up Cluster File Systems

7. The snapshot volume is initially disabled following the split. Use the following commands on

the OHP host to recover and restart the snapshot volume:

# vxrecover -g snapvoldg -m snapvol

# vxvol -g snapvoldg start snapvol

8. On the OHP host, use the following commands to check and locally mount the snapshot

volume:

# fsck -F vxfs /dev/vx/rdsk/diskgroup/volume

# mount -F vxfs /dev/vx/dsk/diskgroup/volume mount_point

Note On Linux, use the -t option, and on AIX, use the -V option, instead of the -F option

for both commands.

For example, to check and mount the volume scfs_vol in the disk group exampledg for

shared access on the mount point, /bak/mnt_pnt:

# fsck -F vxfs /dev/vx/rdsk/exampledg/scfs_vol

# mount -F vxfs /dev/vx/dsk/exampledg/scfs_vol /bak/mnt_pnt

9. Back up the file system at this point using a command such as bpbackup in VERITAS

NetBackup. After the backup is complete, use the following command to unmount the file

system.

# unmount mount_point

10. On the OHP host, use the following command to deport the snapshot volume’s disk group:

# vxdg deport snapvoldg

11. On the master node, re-import the snapshot volume’s disk group as a shared disk group using

the following command:

# vxdg -s import snapvoldg

12. On the master node, use the following command to rejoin the snapshot volume’s disk group

with the original volume’s disk group:

# vxdg join snapvoldg volumedg

For example, to join disk group splitdg with exampledg:

# vxdg join splitdg exampledg

13. The snapshot volume is initially disabled following the join. Use the following commands on

the primary host to recover and restart the snapshot volume:

# vxrecover -g volumedg -m snapvol

# vxvol -g volumedg start snapvol