HP-UX Logical Volume Manager and MirrorDisk/UX Release Notes (February 2007)

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. 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.
As of this writing, these features were not available on previous releases of HP-UX 11i. Contact
your Hewlett-Packard support representative for up-to-the-moment information, 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.
10 Logical Volume Manager and MirrorDisk/UX Release Notes