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

29Converting LVM to VxVM
Restoring the LVM volume group configuration
Use rollback only if the VxVM configuration has not changed since the
conversion. This method restores the LVM configuration without the need
for user data restoration. See “Rollback to LVM using vxvmconvert” on
page 30 for details on using this method.
■ restore user data using vgrestore and frecover
This method is a full LVM restoration which is used to restore your user
data from backup when the VxVM configuration has changed since the
conversion was made. First of all, this method restores the original LVM
configuration information (
vgrestore), and then restores the original user
data from the backup that was made before the conversion was done
(
frecover). See “Full LVM restoration” on page 31 for more information on
using this method.
Note: Restoring user data using the vgrestore and frecover method will result
in the loss of all user data changes made since the conversion, and the loss of all
new volumes created since the conversion.
In other words, this method of restoring data will take you back to exactly where
you were before the conversion was done.
However, if no new volumes have been created, and if none of the existing
volumes have been resized, you can use the
vxvmconvert rollback option to
restore the original LVM configuration. If you use this method, any user data
changes made since the conversion will be retained, and you will not need to
carry out a user level data restore (
frecover).
The name changes that
vxvmconvert makes as part of the conversion are
managed by rollback, and do not count as VxVM configuration changes for the
purposes of choosing a restoration method.
The
vgrestore command should not be confused with the LVM command,
vgcfgrestore. vgcfgrestore is used to restore the LVM configuration
information saved by
vgcfgbackup, but it will not restore your device files
and
/etc/fstab entries. It also will not import and activate the volume group,
nor will it clean up any VxVM information left around. However,
vgrestore will
do all of this for you.