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

28 Converting LVM to VxVM
Restoring the LVM volume group configuration
renames the LVM volume group by replacing the prefix vg in the volume group
name with the prefix
dg. For example, vg08 would become dg08. If there is no vg
in the LVM volume group name,
vxvmconvert simply uses the same volume
group name for its disk group.
The disks in the new VxVM disk group are given VxVM disk media names (see
vxintro(1M)) based on this disk group name. If your new VxVM disk group is
dg08, it will have VxVM disks with names like dg0801, dg0802, etc. The VxVM
plexes within the logical volumes will be
dg0801-01, dg0801-02, etc.
If you do not like the default object names generated by the conversion, use the
standard VxVM utilities to rename these objects. See the rename option in the
vxedit(1M) man page for more details on renaming the disk groups.
Note: You must only rename objects in the VxVM configuration after you are
fully satisfied with that configuration. In particular, you should never use menu
option 3 of
vxvmconvert (Roll back) after name changes. If you have chosen to
set up symbolic links to the VxVM volumes as described in “step 5. Planning for
new VxVM logical volume names,” avoid renaming VxVM objects. These
symbolic links are made invalid if the underlying VxVM device node name
changes.
Restoring the LVM volume group configuration
In some circumstances, you may need to restore the LVM configuration that
existed before you converted to VxVM with
vxvmconvert. For example:
■ If something went wrong during the conversion, such as a system crash or a
disk crash that caused the conversion to be unworkable.
■ If during a conversion only some of a set of volume groups converted
successfully, then you may want to restore the LVM configuration for the
entire set.
It is possible to restore the original LVM configuration in one of two ways, but
both have limitations and restrictions. The method you use depends on if any
changes have been made to the VxVM configuration since the conversion
occurred. Any of the following actions changes the VxVM configuration:
■ adding or removing disks
■ adding or removing volume groups
■ changing the names of VxVM objects
Restoration methods include:
■ rollback using vxvmconvert