HP-UX System Administrator's Guide: Logical Volume Management (762803-001, March 2014)

NOTE: The value of “Pre-allocated LE” should be the sum of “Current pre-allocated LE” and
“Unshared LE.” But, in some instances, this might not be shown as the case while an operation
that changes the logical volume size or while unsharing of extents is in progress. The correct
information will be displayed once the operation is complete.
For more information about the LVM snapshot feature and limitations when snapshots are involved,
see the lvm(7) manpage and the LVM Snapshot Logical Volumes white paper.
3.12 Managing the lvmpud Daemon
The lvmpud daemon is used to handle online shared volume group reconfiguration (introduced
in the HP-UX 11i v3 September 2009 Update) and automatic increase of pre-allocated extents for
space efficient snapshots (introduced in the 11i v3 September 2010 Update). This daemon must
be running to enable these two features.
A startup script (/sbin/init.d/lvm) is delivered as of the HP-UX 11i v3 September 2009
Update to start and stop this daemon. A configuration file (/etc/rc/config.d/lvmconf) is
provided to configure automatic startup. To have lvmpud started automatically at each boot,
include the following line in the /etc/rc.config.d/lvmconf file:
START_LVMPUD=1
To stop the daemon manually, use the following command:
#/sbin/init.d/lvm stop
To start the daemon manually again, use the following command:
#/sbin/init.d/lvm start
To start the lvmpud daemon even if START_LVMPUD is not set to 1, enter:
#lvmpud
See the lvmpud(1M) manpage for full details of this daemon.
3.13 Managing boot disks of size greater than 2 TB
Beginning HP-UX 11i v3 March 2013 Update release, the maximum boot disk size supported with
LVM boot layout is enhanced from 2 TB to 16 TB on HP Integrity systems. This means that HP-UX
can now be installed on disks up to 16 TB in size with LVM boot layout.
Table 9 Maximum supported boot disk size with LVM boot layout
Maximum supported boot disk size with LVM boot layout
HP-UX 11i v3 OE Update HP 9000 systemsHP Integrity Systems
2 TB1 TBPrior to March 2011
2 TB2 TBMarch 2011 and later
2 TB16 TB*March 2013 and later
* This new limit is supported only from LVM volume group version 2.2 onwards.
NOTE: Ignite-UX product March 2013 release (or later versions) is required when boot with
higher disk size is attempted. For example, the Ignite-UX product March 2013 (or later version) is
required when install or recovery is attempted on a disk of size >2 TB. The attempted use of disks,
physical volumes, or logical volumes with sizes higher than the supported limits might result in
errors or failures.
NOTE: LVM already supports data disks of size up to 16 TB for 2.x volume group version. Run
the lvmadm(1M) command with the -t option to view information about data disk limits. Also,
see “Appendix A: LVM Specifications and Limitations”
3.12 Managing the lvmpud Daemon 111