HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes HP-UX 11i v3 (September 2010)

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. 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.

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.

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.