VERITAS Volume Manager 3.1 Migration Guide

Converting LVM to VxVM
Converting LVM Volume Groups to VxVM Disk Groups
Chapter 230
You can also list the LVM disks with the following VxVM command:
# vxdisk list
2. Analyzing an LVM volume group to see if conversion is
possible
After you have selected a volume group for conversion, you need to
analyze it to determine if conversion for VxVM use is possible.
Use the analyze option of vxvmconvert to check for problems that would
prevent the conversion from completing successfully. This option checks
for all the conditions listed in “Volume Group Conversion Limitations”.
The analysis calculates the space required to add the volume group disks
to a VxVM disk group, and to replace any existing disks and volumes
with VxVM volumes, plexes, and subdisks. If you don’t have the required
space to convert the disks, the conversion would fail.
Analysis can berun on alive system while users are accessing their data.
To analyze LVM volume groups, choose option 1 of the vxvmconvert
utility.
NOTE The analysis option is presented as a separate menu item in
vxvmconvert, but there is an implicit analysis with any conversion. If
you simply select the “Convert LVM Volume Groups to VxVM” menu
option, vxvmconvert will go through analysis on any group you specify.
When you are using the convert option directly, you are given a chance to
abort the conversion after analysis, and before any changes are
committed to disk. For more information, see “Converting LVM Volume
Groups to VxVM Disk Groups”.
The analysis option is useful when you have a large number of
groups/disks for conversion and some amount of planning is needed
before the actual conversion. Installations with many users or critical
applications can use the analyze option on a running system. Then
conversion downtime can be better planned and managed. Smaller
configurations may be better served by using the convert option directly
while in a downtime period.
Sample examples of the analyze option are shown in “Examples”.