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

39Online database backup
Making an off-host backup of an online database
12 On the primary host, use the following command to rejoin the snapshot
volume’s disk group with the original volume’s disk group:
# vxdg join snapvoldg volumedg
13 The snapshot volume is initially disabled following the join. Use the
following command on the primary host to recover and restart a snapshot
volume:
# vxrecover -g volumedg -m snapvol
14 On the primary host, reattach the snapshot volumes to their original volume
using the following command:
# vxsnap -g volumedg reattach snapvol source= vol \
[
snapvol2 source= vol2 ]...
For example, to reattach the snapshot volumes svol1, svol2 and svol3:
# vxsnap -g dbasedg reattach svol1 source=vol1 \
svol2 source=vol2 svol3 source=vol3
While the reattached plexes are being resynchronized from the data in the
parent volume, they remain in the SNAPTMP state. After resynchronization
is complete, the plexes are placed in the SNAPDONE state. You can use the
vxsnap print command to check on the progress of synchronization.
Repeat steps 2 through 14 each time that you need to back up the volume.
For an example of a script that uses this method, see “Script to initiate online
off-host backup of an Oracle database” on page 63.
In some instances, such as recovering the contents of a corrupted volume, it may
be useful to resynchronize a volume from its snapshot volume (which is used as
a hot standby):
# vxsnap -g diskgroup restore volume source= snapvol \
destroy=yes|no
The destroy attribute specifies whether the plexes of the snapshot volume are
to be reattached to the original volume. For example, to resynchronize the
volume dbase_vol from its snapshot volume snap2_dbase_vol without
removing the snapshot volume:
# vxsnap -g dbasedg restore dbase_vol \
source=snap2_dbase_vol destroy=no
Note: You must shut down the database and unmount the file system that is
configured on the original volume before attempting to resynchronize its
contents from a snapshot.