HP StorageWorks HSG80 ACS Solution Software V8.8 for HP-UX Installation and Configuration Guide (AA-RV1FA-TE, March 2005)

Preparing the Host System
124 HSG80 ACS Solution Software V8.8 for HP-UX Installation and Configuration Guide
For further information, refer to the HP StorageWorks HSG60 and HSG80 Array
Controller and Array Controller Software Maintenance and Service Guide.
An upgrade performed while the subsystem is up and running is known as a
“Rolling Upgrade”. This type of upgrade does not require a shutdown and restart
of the subsystem for the upgrade changes to take effect.
Recommendations for doing a rolling upgrade are:
■ Upgrade when disk activity is at a minimum.
■ Have at least two good flashcard copies of the ACS V8.8-1 firmware.
■ Check the disks and disable writeback cache on all units by typing the
following commands. Make a note of all units changed.
HSG80> show d1
HSG80> set d1 nowriteback_cache
■ Ensure that mirrored cache is disabled by typing:
HSG80> set this nomirrored_cache
■ Allow two minutes for storage recovery after each controller has been
upgraded.
■ After upgrading the second controller, a manual restart is required.
■ In some cases a vgchange –a y must be invoked to bring the volume group
back online. This is due to a path change or time out of the volume group.