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LVM

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Overview


The Logical Volume Manager (LVM) is a subsystem for managing disk space. The HP-UX LVM subsystem offers value-added features that enhance availability and performance, for example, mirroring (with the optional HP MirrorDisk/UX software), high-availability (with the optional HP Serviceguard software), and striping.

Features and Benefits

LVM provides the following features and benefits:

  • Logical volumes that span multiple disks.
  • Dynamic expansion and contraction of logical volume size.
  • Logical volumes that are striped (RAID 0), mirrored (RAID 1), or striped and mirrored (RAID 1+0).
  • Fast resynchronization of mirrored logical volumes after a crash, using a Mirror Write Cache.
  • Volume groups that are shared among multiple nodes in a high-availability Serviceguard cluster.
  • Online Disk Replacement (OLR) for replacing LVM disks within an active volume group.
  • Temporarily quiescing (suspending) I/O operations to a volume group, for creating consistent backups of active volume groups.
  • Online LUN expansion and LUN contraction.
  • Online modification of volume groups settings.

LVM Version 2.x volume groups provide additional features and benefits:

  • Version 2.x volume groups support larger maximum limits than Version 1.0 volume groups. For information on the increased limits, see the LVM Limits Whitepaper at http://www.hp.com/go/hpux-LVM-VxVM-docs. Then, scroll down to the White papers section.
  • Mirror Write Cache for shared volume groups in an HP Serviceguard cluster.
  • The ability to change the configuration of an active shared volume group in a cluster without deactivating the volume group on any node. Applications stay available on all nodes sharing the volume group.
  • New snapshot logical volumes enable you to create point-in-time images of logical volumes, which reduces the space required for backing up data on logical volumes.
  • Support for cluster device special files (cDSFs). This feature is effective only in a cluster environment and requires that you install HP Serviceguard A.11.20 and the required patches to support cluster-wide device special files.
  • Enhancement of the snapshot feature to automatically increase the pre-allocated extents when a threshold value is reached.
  • Enhancement to detect and exclude half dead disks (faulty media disks).
  • Enhancement to support boot disks of size greater than 2 TB (up to 16 TB) with LVM volume group version 2.2 onwards.

 

LVM product in HP-UX 11iv3 operating system follows the following naming convention for bundle version: B.11.31.yymm[.minor] Here yy denotes last two digits of the released year and mm is released month number. For example, 1103 in place of yymm represents the March-2011 web release. The minor version usually will not be used and if present it denotes minor revisions on the web release

The following LVM releases are currently available as web releases:

  • B.11.31.1303
  • B.11.31.1309
  • B.11.31.1311
  • B.11.31.1403
Note: B.11.31.1309 release has a known problem with Japan and Korean locales which has been fixed in B.11.31.1311 release. For more information, see "Known Issues” section in LVM 11i v3 September 2013 Release notes.

For information on defect fixes and new features for all LVM releases, see the LVM release notes, white papers, and administrator guide in the 11.31 Logical Volume Manager documentation, at: http://www.hp.com/go/hpux-LVM-VxVM-docs

 

 
Additional product information
Product #: BaseLVM
Version: B.11.31.1311
Software specification: HP-UX 11i v3 version B.11.31.1403(BaseLVM_B.11.31.1403_HP-UX_B.11.31_IA_PA.depot)
HP-UX 11i v3 version B.11.31.1311(BaseLVM_B.11.31.1311_HP-UX_B.11.31_IA_PA.depot)
HP-UX 11i v3 version B.11.31.1309(BaseLVM_B.11.31.1309_HP-UX_B.11.31_IA_PA.depot)
HP-UX 11i v3 version B.11.31.1303(BaseLVM_B.11.31.1303_HP-UX_B.11.31_IA_PA.depot)
Installation
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