HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes HP-UX 11i v3 (B.11.31) HP Part Number: 5991-7518 Published: February 2007 Edition: 1.
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Table of Contents Logical Volume Manager and MirrorDisk/UX Release Notes......................................5 About this Document.................................................................................................................................5 LVM and MirrorDisk/UX Overview............................................................................................................5 LVM...........................................................................................................
Logical Volume Manager and MirrorDisk/UX Release Notes About this Document This document provides information about the HP-UX 11i v3 release of Logical Volume Manager (LVM) and MirrorDisk/UX. LVM and MirrorDisk/UX Overview LVM Logical Volume Manager (product 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.
NOTE: Individual physical volumes or logical volumes cannot be quiesced using this feature. To temporarily quiesce a physical volume, use the pvchange command to disable all links to it. To quiesce a logical volume, deactivate the volume group; to provide a stable image of a logical volume without deactivating the volume group, mirror the logical volume, then split off one of the mirrors using the lvsplit command.
configured with such striped mirrors cannot be imported on releases before HP-UX 11i v3; see the “Compatibility Issues” section. To maximize data integrity for striped mirrors, LVM enforces a strict allocation policy; that is, mirrored physical extents must be allocated on different physical volumes. This forces the physical extents used by all the replicas of a strip onto different physical volumes.
Installation Requirements This section describes the installation requirements for this release. Required Hardware LVM and MirrorDisk/UX have no hardware requirements beyond the requirements of the HP-UX 11i v3 operating system. Both products run on all supported HP 9000 and HP Integrity servers. Required Software Since LVM is installed with the HP-UX 11i v3 operating environment, there are no software requirements beyond the requirements of the HP-UX 11i v3 operating system.
Compatibility Issues This release is specific for HP-UX 11i v3 (B.11.31). Moving from HP-UX 11i v2 to HP-UX 11i v3 If you are migrating a system from HP-UX 11i v2 to HP-UX 11i v3, please refer to the LVM migration white paper described in the “Related Documentation” section. It contains information on migrating an LVM configuration from the legacy naming model to the agile naming model. Existing LVM configurations created on HP-UX 11i v2 continue to work on HP-UX 11i v3 under the legacy naming model.
• associated volume group will fail on a previous HP-UX release. To import the volume group, you must remove the incompatible logical volumes or reduce them to a single mirror. Mirror Write Cache (MWC): When a volume group containing a logical volume using the Mirror Write Cache is activated on HP-UX 11i v3, its Mirror Write Cache format is converted to a new format.
Related Documentation The latest documentation for LVM is available in English at http://docs.hp.com in the HP-UX Operating Environment collection.
