VERITAS Volume Manager 3.5 Migration Guide (August 2002)

Converting LVM Volume Groups to VxVM Disk Groups Final 24 July 2002
10 VERITAS Volume Manager Migration Guide
Removing LVM Disk Information
To remove LVM disk information from the disks use the following command:
# pvremove disk_name
The pvremove command will not allow the removal of disk headers which indicate a
Volume Group membership for the disk. If the disk fails pvremove for this reason, you
should first makecertain that thegroupmembership information isstale. Do this byusing
pvdisplay:
# pvdisplay disk_name
If pvdisplay finds no valid group information associated with the disk, you can
overwrite the LVM headers using pvcreate:
# pvcreate disk_name
Caution If disk_name is an alternate path to a disk that does not appear in the lvmtab
file for this system, or is a disk that is in use on another system, but not
imported onto this system, then do not pvcreate -f the disk. Doing so will
destroy the LVM headers. You can use pvcreate without the -f option safely,
as it will only succeed if the disk is not listed lvmtab and the LVM headers
indicate it is not a member of any volume group. (That is, it has been
pvcreated but not been an argument for vgcreate or vgextend.)
Initializing Disks for VxVM Use
To initialize the disk for VxVM use, use the vxdiskadm command, selecting the option:
1) Add or initialize one or more disks
Or use the command:
# vxdisk init disk_name
VxVM utilities will not tamper with disks that are recognized as owned by LVM (by
virtue of the LVM disk headers). If you attempt to use
vxdisk init, or vxdiskadm on an LVM disk without using the pvremove command
first, the command will fail.
Converting LVM Volume Groups to VxVM Disk Groups
This section outlines the process for converting LVM volume groups to VxVM disk
groups.