HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes HP-UX 11i v3 September 2013 Web Release B.11.31 (5900-3304)

• Striped Mirrors: Releases prior to HP-UX 11i v3 only support extent-based striping via the -D
option to lvcreate. If a logical volume using simultaneous mirroring and non-extent-based
striping is created on HP-UX 11i v3, attempts to import or activate its 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.
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 striped mirrors.
• 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. Importing or activating the volume group on a previous HP-UX release does
not recognize the new format and triggers a full resynchronization of the mirrors.
NOTE: Patch PHKL_36244 adds support for the new MWC format to HP-UX 11i v2. Installing
this patch avoids the unnecessary resynchronization.
In the future, HP might add support of larger logical volumes and striped mirrors to previous releases
of HP-UX 11i. However,
As of this writing, larger logical volumes and striped mirrors are only available on HP-UX 11i v3
and HP-UX 11i v2 (with patches). For up-to-the-moment information, contact your Hewlett-Packard
support representative or consult the Hewlett-Packard IT Resource Center site: http://itrc.hp.com
(Americas and Asia Pacific) or http://europe.itrc.hp.com (Europe) for LVM patches.
6.5 Sharing volume groups in an HP Serviceguard cluster
To share a volume group in an HP Serviceguard cluster where the cluster nodes have different
versions of the LVM product installed, use the following guidelines:
• To share a version 2.1 volume group, you must install the HP-UX 11i v3 September 2008
release or above on all the cluster nodes.
• To share a 2.2 volume group, you must install the HP-UX 11i v3 March 2010 release or above
on all the cluster nodes.
• To use the Multi Node Online Reconfiguration (MORE) feature, you must install the HP-UX 11i
v3 September 2009 release or above on all nodes of the cluster. Further, you can use MORE
only on version 2.1 or above volume groups.
NOTE: MORE does not operate in a cluster with both HP-UX 11i v3 September 2009 and
HP-UX 11i v3 March 2010 nodes. During a rolling update from HP-UX 11i v3 September
2009 to HP-UX 11i v3 March 2010, you cannot use MORE on the shared volume group.
7 Related documentation
LVM and MirrorDisk/UX manpages are installed with the product and provide the latest
documentation for all LVM commands and options. These manpages can be displayed via the man
command.
In addition, LVM user documentation is available in English at http://www.hp.com/go/
hpux-core-docs. Available documents include:
• HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes (this version and previous
versions)
• HP-UX System Administrator's Guide: Logical Volume Management (this document is localized)
• LVM 2.0 Volume Groups in HP-UX 11i v3
• LVM New Features in HP-UX 11i v3
12 Logical Volume Manager and MirrorDisk/UX Release Notes