LVM (Logical Volume Manager) & MirrorDisk/UX

Logical Volume Manager (LVM) is the HP-UX default Volume Manager. It provides flexibility in configuring and managing mass storage resources. In HP-UX 11i v3, the LVM kernel and commands are delivered as an always-installed ISU (Independent Software Unit), bundled with the core HP-UX product. MirrorDisk/UX (B2491BA) is an optionally purchased HP-UX ISU product to enable LVM mirroring functionality.

Summary of Change

Parallel Resynchronization: the lvextend, lvmerge, and lvsync commands have new options to control the synchronization of stale extents.
Parallel Opens: the vgchange command has a new -T option to open physical volumes in parallel during volume group activation.
Alternate Link Behavior: the pvchange command has a new option to control the way LVM monitors alternate links of a multi-pathed physical volume.
Defect Fixes.

Impact

Parallel re-synchronization and parallel opens reduce serialization in LVM, improving system response time.

Compatibility

There are no known compatibility issues.

Performance

There are no known performance issues.

Documentation

For details of these enhancements and defect fixes, see the HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes at http://docs.hp.com/en/oshpux11iv3.html#LVM%20Volume%20Manager.

For more information about LVM, see HP-UX System Administration: Logical Volume Management, as well as numerous LVM white papers, available at the same Web site.

In addition, there are over thirty existing manpages for LVM and its commands. lvm(7) provides an overview and list of commands.

Obsolescence

There are no new obsolescence issues beyond those described for the February 2007 release of HP-UX 11i v3.