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

2
On any 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
This command can be run every time you want to back up the data. The vxsnap
refresh command will resync only those regions which have been modified
since the last refresh.
3
On any node of the cluster, use the following command to wait for the contents
of the snapshot to be fully synchronous with the contents of the original
volume:
# vxsnap -g volumedg syncwait snapvol
For example, to wait for synchronization to finish for the snapshots scfs_vol:
# vxsnap -g exampledg syncwait scfs_vol
Note: You cannot move a snapshot volume into a different disk group until
synchronization of its contents is complete. You can use the vxsnap print
command to check on the progress of synchronization.
4
On the master node, use the following command to split the snapshot volume
into a separate disk group, snapvoldg, from the original disk group, volumedg:
# vxdg split volumedg
snapvoldg
snapvol
For example, to place the snapshot of the volume cfs_vol into the shared
disk group splitdg:
# vxdg split exampledg splitdg scfs_vol
171Off-host cluster file system backup
Using off-host processing to back up cluster file systems