HP StorageWorks HSG80 Array Controller V8.7 Maintenance And Service Manual page 125

4. If upgrading from ACS Version 8.6S to 8.7S, 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 19.
c. Individually delete all snapshot units using the following command:
HSGA> DELETE snapshot-unit-name
5. Verify that all appropriate units were deleted using the following command:
HSGA> SHOW UNITS FULL
IMPORTANT: If any snapshot unit exists, repeat step 4.
6. 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 17.
7. For each unit, identify and record the unit WRITEBACK_CACHE,
READAHEAD_CACHE, READ_CACHE and PREFERRED_PATH
characteristics using the following command:
HSGA> SHOW UNITS FULL
These characteristics are modified during the upgrade procedure and must be
restored in step 18.
NOTE: The Preferred Path switch is only available with a multiple-bus configuration. It is
not available in the transparent failover mode.
8. 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
HSG80 Array Controller V8.7 Maintenance and Service Guide
Upgrading the Subsystem
5–5