HP-UX HB v13.00 Ch-13 - LVM

HP-UX Handbook – Rev 13.00 Page 6 (of 110)
Chapter 13 LVM
October 29, 2013
LVM Versions
As of the March 2010 release of HP-UX 11i Version 3, LVM supports four versions of
volume groups. Version 1.0, 2.0, 2.1, and 2.2 enable the configuration of larger volume
groups, logical volumes, physical volumes, and other parameters.
Version #
Supported Supported Bootable Volume Group
--------------- --------------------------------------------- -------------------------------
Version 1.0 HP-UX 11i yes
Version 2.0 HP-UX 11i V3 March 2008. no
Version 2.1 HP-UX 11i V3 September 2008 no
Version 2.2 HP-UX 11i V3 March 2010 Update and forward. yes
Device Files
As of HP-UX 11i Version 3, disk devices can be represented by legacy and persistent
device files in the /dev directory.
Legacy device hardware path information such as SCSI bus, target, and LUN encoded
in the device file name and minor number. For example, the legacy device file
/dev/dsk/c3t2d0 represents the disk at card instance 3, target address 2, and lun
address 0.
Persistent device files are not tied to the physical hardware path to a disk, but instead
map to the disk's unique worldwide identifier (WWID). For example, /dev/disk/diskn,
where n is the instance number assigned to the disk.
Serviceguard A.11.20 uses cluster-wide device files (cDSFs). A cluster device special
file provides a consistent set of device special files across a set of cluster nodes. For
example, /dev/cdisk/diskn, where n is the instance number assigned to the disk.
LVM Structural Information
This information applies only to disks belonging to Version 1.0 and Version 2.2 (or
higher) volume groups.There are two kinds of LVM disk layouts—for boot disks and all