VERITAS Volume Manager 3.1 Migration Guide

Converting LVM to VxVM
Converting LVM Volume Groups to VxVM Disk Groups
Chapter 228
primary swap volumes. These are volumes known to the boot process.
However, swap volumes on volumesother thanthe root volume can be
converted (as long as this volume is not in the same volume group as
the root volume).
• Volume group disks used in MC/ServiceGuard clusters.
The conversion process does not support conversion of any volume
group that is marked as a member of a MC/ServiceGuard or OPS
Edition high availability cluster. The volume group must be
deactivated and removed from membership in the high availability
cluster before it can be converted.
• Volume groups used for cluster lock disks.
The conversion process does not support conversion of a volume group
that contains a disk that is being used for a cluster lock disk for an
MC/ServiceGuard cluster.
• Volume groups with any disks that have bad blocks in the bad block
directory.
Unlike LVM, VxVM does not support bad block revectoring at the
physical volume level. If there appear to be any valid bad blocks in
the bad block directory of any disk used in an LVM volume group, the
group cannot be converted. See Appendix A, Conversion Error
Messages, for actions to take in this situation.
• Not enough disk space on the root file system to save a copy of each
physical disk’s LVM metadata.
For large volume groups, for example, 200 GB, using approximately
twenty 9GB drives, the space needed could be as much as 30 MB.
• Volume groups with mirrored volumes.
A conversion fails if the LVM volume group being converted has
mirrored volumes, but the system does not have a valid license
installed that enables mirroring for VxVM.
The analyze option in vxvmconvert, which is described in later sections,
aids you in identifying which volume groups can be converted.
Conversion Process Summary
Several steps are used to convert LVM volume groups to VxVM disk
groups. Most of these steps can be done with the vxvmconvert utility. All
the steps are not compulsory, and some may have to be followed only if