HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes (April 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 March 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 March 2009 release of LVM and MirrorDisk/UX provides migration capabilities, enables a
volume group to take advantage of LUN expansion, contraction, and reprovisioning online, and
provides performance enhancements.
New and Changed Features in This Release
New Features
The following LVM features are new with the March 2009 release of HP-UX 11i v3:
Migration
The new vgversion command enables you to perform the following migrations for existing
volume groups:
• Version 1.0 volume groups to either Version 2.0 or Version 2.1 volume groups
• Version 2.0 volume groups to Version 2.1 volume groups
• Version 2.1 volume groups to Version 2.0 volume groups
For more information, see vgversion(1M).
About this Document 5