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Read these guidelines carefully before beginning any volume group conversion. The conversion process involves many steps. Although the tools provided help you with the conversion, some of the steps cannot be automated. Make sure that you understand how the conversion process works and what you need to do before trying to convert a volume group. Make sure that you have taken backups of the data on the volumes.
The conversion utility, vxvmconvert, is an interactive, menu-driven program that walks you through most of the steps for converting LVM volume groups. LVM volume groups are converted to VxVM disk groups in place. The public areas of the disks that contain user data, (file systems, databases, and so on) are not affected by the conversion. However, the conversion process overwrites the LVM configuration areas on the disks, and changes the names of the logical storage objects. For this reason, conversion is necessarily an off-line procedure. All applications must be shut down that would normally access the volume groups that are undergoing conversion.
During the conversion, the vxvmconvert utility tries to create space for the VxVM private region by using on-disk data migration. If a disk has enough available free space, no intervention is required. If there is insufficient space on the disk, the vxvmconvert utility displays a list of suitable disks in the same volume group to which the data can be migrated. After selecting a disk, the data is migrated to create space for the VxVM private region.