Veritas Volume Manager 5.0.1 Migration Guide, HP-UX 11i v3, First Edition, November 2009

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. Additional information is available

on all the conditions that this option checks for.

See “Volume group conversion limitations” on page 22.

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 be run on a live 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.

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.

More information is available on converting disk groups.

See “Converting LVM volume groups to VxVM disk groups” on page 21.

Sample examples of the analyze option are available.

See “Examples” on page 37.

Taking actions to make conversion possible if analysis fails

Available is a list of reasons that may cause analysis to fail.

See “Volume group conversion limitations” on page 22.

Converting LVM to VxVM

Converting LVM volume groups to VxVM disk groups