HP StorageWorks HSG80 Array Controller V8.7 Maintenance And Service Manual page 144

Upgrading the Subsystem
2. Connect a PC or terminal to the maintenance port of Controller A, at the target
site.
3. Delete all snapshot units.
a. Identify all snapshot units using the following command:
HSGA> SHOW UNITS FULL
b. Record the configuration for each snapshot unit for restoration in step 12.
c. Individually delete all snapshot units using the following command:
HSGA> DELETE snapshot-unit-name
4. Verify that all snapshot units were deleted using the following commands, as
required:
HSGA> SHOW UNITS FULL
IMPORTANT: If any snapshot unit exists, repeat step 4.
5. Identify and record the current CACHE_FLUSH_TIMER value 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=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 in step 11.
6. 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
7. Determine if all data has been flushed from the cache module, using the following
command:
HSGA> SHOW THIS_CONTROLLER
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