HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software Maintenance and Service Guide (EK-G80MS-SA. C01, March 2005)

Upgrading the Subsystem
226 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
Downgrading ACS V8.8- x to V8.6-1 or V8.7-1
This document describes the procedures necessary to downgrade the controller
from the ACS V8.8-x to V8.6-1 or V8.7-1. Downgrading controllers to the
previous version should only be completed by HP authorized service personnel.
Failure to properly follow the downgrade procedures may result in the loss of
data.
Prior to downgrading, ensure that the following items have been completed:
■ Dismount all units from the host operating system.
■ Terminate any I/O activity to the controller pair that is to be downgraded.
■ Normalize all RAIDsets, mirrorsets, and remote copysets.
■ Delete any existing snapshot units.
The following controller information is lost during the downgrade procedure:
■ Host information that is stored in the expanded area of the host definition
tables.
■ The HBA reservation style information is converted to the standard
reservation style.
Caution: Storagesets or disk devices created or initialized while running
V8.8-
x can become inaccessible after the downgrade to V8.6-1 or V8.7-1. If
you initialize a container and used the SAVE CONFIGURATION switch and
you then downgrade to ACS V8.7-1 or V8.6-1, the associated units have
MEDIA FORMAT ERROR as the state of the unit. These units must be deleted
and added again while running the downgraded. If data exists on units with
a media format error, you must back up existing data to avoid losing data.
Consider the following items before you downgrade ACS:
■ Both controllers need to be downgraded prior to starting V8.6-1 or V8.7-1. In
other words, both controllers are be stopped (halted) by the downgrade utility
with a 39 LED code on the port buttons before restarting them with V8.8-x.
■ After downgrading ACS to V8.6-1 or V8.7-1, note that the ECB end-of-life
duration is reduced by 1 ½ years and the ECB end-of-life extended flag is
cleared.