Managing The Lvmpud Daemon - HP -UX 11i Administrator's Manual

The current and the maximum snapshot capacity for the volume group.
The listing of snapshot logical volumes and some snapshot related attributes for each.
The lvdisplay command now additionally displays the following data for a logical volume which
has snapshots associated with it:
The number of snapshots associated with the logical volume
A listing of the names of the snapshot logical volumes associated with the logical volume.
For a snapshot logical volume, the following new details are displayed:
The LV Status will now also display the type of snapshot.
The state of the snapshot (operative, inoperative, over-committed, etc).
The total number and the current number of pre-allocated logical extents associated with the
snapshot volume.
The number of logical extents that are currently allocated or unshared for the snapshot.
The current number of pre-allocated physical extents for the snapshots.
The name of the logical volume of which this logical volume is a snapshot.
The creation timestamp for the snapshot.
The state of whether automatic increase of pre-allocated extent is enabled or not.
The threshold value of a space efficient snapshot logical volume.
A listing of the distribution of the unshared logical and physical extents for the snapshot.
A listing of the pre-allocated extents for the snapshot.
A listing of the logical extents of the snapshot that have been unshared, and mapping of these
logical extents to physical extents.
The pvdisplay command now additionally displays the following data:
The number of pre-allocated physical extents on it.
A listing of the distribution of unshared physical extents per logical volume that lie on this
physical volume.
The extent mapping for the physical volume will indicate pre-allocated extents with a status
of "pre-allocated".
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.

Managing the lvmpud Daemon

The lvmpud daemon is used to handle online shared volume group reconfiguration (introduced
in the HP-UX 1 1i v3 September 2009 Update) and automatic increase of pre-allocated extents for
space efficient snapshots (introduced in the 1 1i 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 1 1i 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:
Managing the lvmpud Daemon 105