HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes HP-UX 11i v3 September 2010 (B.11.31) HP Part Number: 5900-0873 Published: September 2010, April 2011 Edition: 7.
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Contents Logical Volume Manager and MirrorDisk/UX Release Notes...............................4 About this document.................................................................................................................4 LVM and MirrorDisk/UX overview...............................................................................................4 Overview of changes...........................................................................................................
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 2010 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.
vgchange enhancement The vgchange command now enables you make a volume group cluster aware (vgchange –c y) even if the cluster daemon is not running. For more information, see vgchange(1M). Deprecated or obsolete features No LVM or MirrorDisk/UX features are deprecated or obsolete in the September 2010 release of HP-UX 11i v3. Known problems fixed in this version The following table lists the known LVM and MirrorDisk/UX problems fixed in the September 2010 release of HP-UX 11i v3.
Table 1 LVM Fixes in HP-UX 11i v3 September 2010 (continued) Defect ID Description QXCR1001012778 When an online vgmodify is performed on a Version 1.0 volume group that has the root logical volume from which the system is booted, the system hangs and must be rebooted. QXCR1001013882 In some cases, when a physical volume is removed from a volume group, the system panics. There is no specific symptom to identify this panic. The panic occurs in the lvmp_vg_lvix_to_minor function.
Severity: Low Corrective Action: None. You can ignore this message. After an lvextend failure the deletion of a space-efficient snapshot might cause a panic Defect ID: QXCR1001030741 Problem: This affects space-efficient snapshots only. In some cases, the deletion of space-efficient snapshot logical volumes causes a panic. This can happen after an attempt to increase the size of a logical volume that has snapshots associated with it.
LVM logs a message and tries to increase the pre-allocated extent pool size by threshold value. In the case where the stripe size is two (or small), the default threshold value is reached when there are only 2 pre-allocated extents free. When this threshold is reached and if auto pre-allocation is enabled, LVM tries to increase the pre-allocated pool size only by 2 extents, which is very small.
Mass Storage Critical Resource Analysis The Mass Storage Critical Resource Analysis (MS CRA) tool checks for a maximum of two mirror copies of a logical volume. However, Version 2.0 and higher volume groups allow up to five mirror copies. To enable MS CRA to check for a maximum of five mirror copies of a volume, you must install the following patch, or a superseding patch: • PHCO_37562 MS CRA checks for a maximum of 511 physical volumes in a volume group. However, Version 2.
to the September 2008 release. Version 1.0 volume groups are supported on all supported versions of HP-UX, including 11i v1, 11i v2, and 11i v3. • The following HP-UX product does not currently support Version 2.x volume groups: ◦ HP Process Resource Manager (HP PRM) This product plans to add support of Version 2.x volume groups. For the most recent information on this products, see the IT Resource Center (ITRC) at http://itrc.hp.com, or consult the release notes for the specific product.
activated and the logical volume can be used, but any data in that logical volume beyond 2 TB will be inaccessible. NOTE: Patches PHKL_36745, PHCO_36744, and PHCO_37939 resolve this compatibility issue for HP-UX 11i v2. Installing these patches enables the creation and use of logical volumes up to 16 TB. • Striped Mirrors: Releases prior to HP-UX 11i v3 only support extent-based striping via the -D option to lvcreate.
• LVM New Features in HP-UX 11i v3 • LVM Limits • LVM Migration from Legacy to Agile Naming Model: HP-UX 11i v3 • LVM Online Disk Replacement (LVM OLR) • Using the vgmodify command to Perform LVM Volume Group Dynamic LUN Expansion (DLE) and Contraction (DLC) • LVM Volume Group Quiesce/Resume • SLVM Single-Node Online Reconfiguration (SLVM SNOR) • SLVM Online Reconfiguration • When Good Disks Go Bad: Dealing with Disk Failures under LVM • Using the vgversion Command to Perform LVM Volume G
*5900-0873* Printed in the US
