VERITAS Volume Manager 4.1 Migration Guide

Converting LVM to VxVM
Restoring the LVM Volume Group Configuration
Chapter 216
Full LVM Restoration
If you need to restore the original LVM configuration, but changes have been made to the
VxVM configuration, you cannot use the rollback option of vxvmconvert. In this case, you
must restore the user data in addition to restoring the old LVM metadata and associated
configuration files. You may need to use this method if the disks in use by the LVM/VxVM
volumes were corrupted during or after conversion.
NOTE The snapshot of LVM internal data is kept on the root filesystem.
To use this method, you must have backed up data located on all the volume groups' logical
volumes before conversion to VxVM.
Restoration of LVM volume groups is a two-step process consisting of a restoration of LVM
internal data (metadata and configuration files), and restoration of user or application data.
The process is limited to restoring the state of the logical volumes as they existed prior to
conversion to VxVM disks. If the data has changed on the volumes during the time they were
VxVM volumes, those changes are lost once you restore the LVM configuration and saved user
data.
To do a full restoration of the original LVM configuration, do the following:
Step 1. Use vgrestore to restore LVM internal data.
# vgrestore vol_grp_name
Step 2. Use the recovery method to restore user or application data. In preparation for
conversion, the recovery method should have been done with the standard backups
you made in preparation for conversion. The following example shows an frecover
from the fbackup example in “4. Backing up your LVM configuration and user data”
on page 9
# mount -F vxfs /dev/vg01/lvol3 /foodir
# frecover -r -f /dev/rmt/c0t0d0BEST