Veritas Volume Manager 5.0 Migration Guide, HP-UX 11i v3, First Edition, May 2008

23Converting LVM to VxVM
Converting LVM volume groups to VxVM disk groups
You can back up the LVM volumes using the following command:
# vgcfgbackup -f pathname / filename vol_grp_name
Be sure to use the -f option to save the data into a file other than the default.
vxvmconvert uses LVM utilities which themselves save the configuration using
vgcfgbackup. If you do not use the -f option when you attempt to backup the
configuration, the conversion process will overwrite your attempted backup.
A copy of this LVM configuration should be kept off-line on tape or some other
medium for use in the event of a disaster during conversion.
For example, to put a copy on tape, use the following command:
# tar cvf /dev/rmt/c3t0d0BEST /vgbackups/vg08
Note: The vxvmconvert utility itself also saves a snapshot of the LVM metadata
in the process of conversion for each disk. This data is saved in a different
format from that of
vgcfgbackup. It can only be used via the vxvmconvert
program. With certain limitations, you can reinstate the LVM volumes after
they have been converted to VxVM using this data (see “Example: displaying the
vxvmconvert menu” on page 32). Even though
vxvmconvert provides this level
of backup of the LVM configuration, you are advised to use
vgcfgbackup before
running vxvmconvert.
Backing up user data
To back up user data, use your regular backup processes.
Caution: Before you do the backup, you should carefully review “step 9.
Implementing changes for new VxVM logical volume names.” Backup processes
and systems themselves may have dependencies on the volume names currently
in use on your system. The conversion to VxVM changes those names. You are
advised to understand the implications name changes have for restoring from
the backups you are about to make.
File system back up of user data
You can use the backup utility that you normally use to back up data on your
logical volumes. For example, to back up logical volumes that contain file
systems, the
fbackup(1M) command can be used to back up the data to tape.
For example, to backup the data on
/dev/vg01/lvol3 mounted on /foodir, use
the following command:
# fbackup -0i /foodir -f /dev/rmt/c0t0d0BEST