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

Upgrading the Subsystem
190 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
4. Identify and record the current cache flush timer value of the “this controller.”
After issuing the following command, the subsequent screen displays the
cache flush timer value:
HSGA> SHOW THIS_CONTROLLER
Figure 80 shows only a portion of the resulting display—an arrow points to
the pertinent status indication.
Figure 80: Screen display indicating cache flush timer value
5. Identify and record the current cache flush timer value of the “other
controller.” After issuing the following command, the subsequent screen
displays the cache flush timer value:
HSGA> SHOW OTHER_CONTROLLER
Note: The cache flush timer value is displayed in the caching parameters section. This
parameter is modified during the procedure and must be restored later in this
procedure.
6. For each unit, identify and record the unit writeback cache characteristics by
entering the following command:
HSGA> SHOW UNITS FULL
Note: This is modified during the upgrade procedure and must be restored later.
7. Set the cache flush timer to 1 second by entering the following commands:
HSGA> SET THIS_CONTROLLER CACHE_FLUSH_TIMER=1
HSGA> SET OTHER_CONTROLLER CACHE_FLUSH_TIMER=1
8. Disable writeback caching on all units by entering the following command as
required for each unit:
HSGA> SET unit-name NOWRITEBACK_CACHE
Cache:
256 megabyte write cache, version 0022
Cache is GOOD
No unflushed data in cache
CACHE_FLUSH_TIMER=DEFAULT (10 seconds)