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HSG80 Array Controller V8.7 Maintenance and Service Guide
Upgrading the Subsystem
10. After the controllers restart, restore the CACHE_FLUSH_TIMER to the value
recorded in step 6 using the following commands:
HSGB> SET THIS_CONTROLLER CACHE_FLUSH_TIMER=n
HSGB> SET OTHER_CONTROLLER CACHE_FLUSH_TIMER=n
11. Restore all snapshot units removed in step 4.
12. If the CCL was disabled in step 3, enable it using the following command:
HSGA> SET THIS_CONTROLLER COMMAND_CONSOLE_LUN
13. Mount the logical units on the host.
14. Disconnect the PC or terminal from the maintenance port of Controller A.
15. After upgrading the target site controllers, return to step 11 and proceed to
complete the initiator site controllers upgrade.
Downgrading Controller Software
This document describes the procedures necessary to downgrade the HSG80
controller from the Array Controller Software (ACS) Version 8.7 to Version 8.6.
Downgrading controllers to the previous version should be done only by
StorageWorks authorized service personnel. Failure to properly follow the downgrade
procedures may result in the loss of data.
Prior to downgrading, all units must be dismounted from the host operating system.
There must not be any I/O activity to the controller pair that is to be downgraded. All
raidsets, mirrorsets, and remote copysets must be normalized. Any snapshot units
must be deleted prior to beginning the downgrade procedure.
The following controller information is lost during the downgrade procedure:
1. Host information that is stored in the expanded area of the host definition tables.
2. The HBA reservation style information is converted to the standard reservation
style.
CAUTION: Any storage sets or disk devices created or initialized while running V8.7
are inaccessible after the downgrade to Version 8.6. 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 Version 8.6.
Both controllers need to be downgraded prior to starting V8.6. In other words, both
controllers must be stopped with a 39 LED code on the port buttons before restarting
them with V8.7.