VERITAS Volume Manager 3.1 Migration Guide

Converting LVM to VxVM
Restoring the LVM Volume Group Configuration
Chapter 240
To rollback to LVM from the VxVM conversion, run vxvmconvert and
choose option 3. See “Example: VxVM to LVM rollback” for illustration.
CAUTION Do not use this option unless you are certain that you want to restore
LVM volume groups. Once this is run, the VxVM disks that were created
as a result of the original conversion from LVM to VxVM no longer exists.
This option is not a full complement to vxvmconvert. It simply writes the
saved LVM metadata back on top of the disks. Those data can only be
considered valid for the period of time when the logical volumes are
off-line. If the VxVM configuration has been brought online, the
metadata in the rollback snapshot should be considered obsolete. See
“Full LVM Restoration” for specific information.
Full LVM Restoration
If you need to restore the original LVM configuration, but changes have
been made to the VxVM configuration, you cannotuse 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 file system.
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 logicalvolumes 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: