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

Upgrading the Subsystem
197HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
Figure 85 shows only a portion of the resulting display—an arrow points to
the pertinent status indication.
Figure 85: 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 characteristic by
entering the following command:
HSGA> SHOW UNITS FULL
Note: The writeback cache characteristic is modified during the upgrade and must be
restored in step 26 on page 201.
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 to help minimize the failover time 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)