HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes HP-UX 11i v3 March 2008 (B.11.31) HP Part Number: 5992-3818 Published: March 2008 Edition: 3.
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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 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 March 2008 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.
• • • Version 2.0 volume groups do not support disk sparing. Using the -z option to the vgextend or pvchange command displays an error message. The pvck and vgmodify commands are not supported on Version 2.0 volume groups. Some HP-UX products, as described in “Compatibility Issues” (page 12), do not support Version 2.0 volume groups. Table 1 compares the configuration limits of Version 1.0 and Version 2.0 volume groups.
The number of physical extents in a volume group has an architectural limit, so your choice of physical extent size affects the maximum size of the volume group. To display the maximum volume group size for a given physical extent size, use the -E option to vgcreate with the -s option. For example: # vgcreate -V 2.0 -E -s 256 Max_VG_size=2p:extent_size=256m Conversely, to display the minimum physical extent size for a given volume group size, use the -E option to vgcreate with -S.
Changed Features The following features have changed in the March 2008 release of LVM and MirrorDisk/UX: vgcreate Autocreation of Volume Group File The vgcreate command now automatically creates the device file /dev/vgname/group to manage the volume group, regardless of the volume group version. If you want to specify the minor number of the group file, create /dev/vgname/group before running the vgcreate command. To create the volume group device file, follow these steps: 1.
Total Spare PVs Total Spare PVs in use VG Version VG Max Size VG Max Extents • • 0 0 1.0 1082g 69248 lvdisplay displays the logical extent status for up to six physical extents, to accommodate the increased mirror copies for Version 2.0 volume groups. pvdisplay with the -d option displays the offsets to the start and end of the user data in 1KB blocks from the beginning of the physical volume.
Deprecated or Obsolete Features The following features are deprecated or obsolete with the March 2008 release of HP-UX 11i v3: Obsolete Command Options for Version 2.0 Volume Groups The following LVM command options are obsolete. Using them with Version 2.0 volume groups either displays an error message and fails, or displays a warning message and ignores the option. vgcfgrestore vgcreate vgextend pvchange, vgextend pvchange pvcreate lvcreate, lvextend, lvreduce, lvchange -F option displays a warning.
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). The following compatibility issues exist in the March 2008 release of HP-UX 11i v3. Version 2.0 Volume Groups • • • Version 2.0 volume groups are not recognized on previous releases of HP-UX, including previous versions of HP-UX 11i v3. Version 1.0 volume groups are supported on all supported versions of HP-UX, including 11i v1, 11i v2, and 11i v3.
Moving Volume Groups from HP-UX 11i v3 to Previous HP-UX Releases If a volume group used on HP-UX 11i v3 is accessed from a system running a previous release of HP-UX 11i, you may encounter these compatibility issues: • • Version 2.0 volume groups: As noted in “Version 2.0 Volume Groups” (page 12), Version 2.0 volume groups are not recognized on previous releases of HP-UX. Logical volumes larger than 2 TB: Releases prior to HP-UX 11i v3 can only access data within the first 2 TB of a logical volume.
LVM and MirrorDisk/UX manpages are available in English and Japanese. The HP-UX System Administrator's Guide: Logical Volume Management is available in English, French, German, Italian, Japanese, Korean, Spanish, Simplified Chinese, and Traditional Chinese. These documents are on http://docs.hp.com.
