HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes (September 2009)

Logical Volume Manager and MirrorDisk/UX Release Notes
About this Document
This document provides information about the Logical Volume Manager (LVM) and
MirrorDisk/UX products in the September 2009 release of HP-UX 11i v3.
LVM and MirrorDisk/UX Overview
Logical Volume Manager (bundle BaseLVM) is the HP-UX default Volume Manager. It provides
the user with flexibility in configuring and managing mass storage resources. In HP-UX 11i v3,
the LVM kernel and commands are bundled with the core HP-UX product.
MirrorDisk/UX (bundle B2491BA) is an optionally purchased HP-UX product to enable LVM
mirroring functionality.
Overview of Changes
The initial HP-UX 11i v3 release of LVM and MirrorDisk/UX was integrated with the new mass
storage stack, delivering significant performance, scalability, availability, and usability
enhancements. LVM was enhanced to support larger logical volumes, temporary quiescing of
volume groups, and striping with mirroring. Volume group availability was improved: resizing
a LUN and modifying volume group characteristics no longer required the volume group to be
recreated, and replacing a disk could be done online.
The September 2009 release of LVM and MirrorDisk/UX provides data migration capabilities
from one set of physical volumes to another set, the capability to rebalance free space and used
space on physical volumes, and command enhancements for shared volume groups.
New and Changed Features in This Release
New Features
The following LVM features are new with the September 2009 release of HP-UX 11i v3:
Data Mobility
The new vgmove command enables you to migrate LVM data from an old set of physical volumes
to a new set of physical volumes within a single volume group within or across storage frames.
The migration is transparent to the applications; vgmove does not require you to stop applications
accessing the data.
For Version 1 boot volume groups, vgmove automatically creates new boot options.
For more information, see vgmove(1M).
Online LVM Configuration in Shared Clusters
You can now manage LVM on shared clusters without requiring deactivation on all nodes but
one. The following commands support online LVM configuration in shared clusters for Version
2.1 and higher shared volume groups: lvcreate, lvremove, lvextend, lvreduce, lvchange,
vgextend, vgreduce, pvmove, vgmove, vgmodify, lvsplit, and lvmergeon.
The LVM daemon, /usr/sbin/lvmpud, must be running on all nodes in the cluster.
For more information, see vgmove(1M).
Forced Deactivation
A new forced flag (-f) to the vgchange -a n deactivation command enables you to overcome
a prior LVM limitation in which deactivation returns [EBUSY] if an automatic kernel daemon
About this Document 5