HP StorageWorks HSG80 Array Controller V8.7 Maintenance And Service Manual page 134

Upgrading the Subsystem
256 megabyte write cache, version 0022
Cache is GOOD
No unflushed data in cache
CACHE_FLUSH_TIMER=DEFAULT (10 seconds)
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.
6. For each unit, identify and record the unit WRITEBACK_CACHE characteristics
using 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 using 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 using the following command as required
for each unit:
HSGA> SET unit-name NOWRITEBACK_CACHE
9. Determine if all data has been flushed from the cache module, using the following
command:
HSGA> SHOW THIS_CONTROLLER
The following text is only a portion of the resulting display—an arrow points to the
pertinent status indication:
Cache:
256 megabyte write cache, version 0022
Cache is GOOD
No unflushed data in cache
CACHE_FLUSH_TIMER=1 SECOND
IMPORTANT: Repeat step 10 on both controllers (THIS_CONTROLLER and
OTHER_CONTROLLER) until no unwritten data remains in either cache module memory.
If unwritten data is present after several minutes, verify that WRITEBACK_CACHE was
disabled on all units using the SHOW UNITS FULL command. For any units with
WRITEBACK_CACHE enabled, return to step 9 and proceed.
5–14 HSG80 Array Controller V8.7 Maintenance and Service Guide