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

Upgrading the Subsystem
175HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
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.
11. For each unit, identify and record the unit writeback, read ahead, read, and
preferred path characteristics by entering the following command:
HSGA> SHOW UNITS FULL
These characteristics are modified during the upgrade procedure and must be
restored in step 32 on page 180.
Note: The PREFERRED_PATH switch is only available with a multiple-bus
configuration. It is not available in the Transparent Failover mode.
12. 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
13. Clear any unit with PREFERRED_PATH set, by entering the following
command as required for each unit:
HSGA> SET unit-name NOPREFERRED_PATH
14. Disable writeback, read ahead, and read caching on all units by entering the
following command as required for each unit:
HSGA> SET unit-name NOWRITEBACK_CACHE NOREADAHEAD_CACHE
NOREAD_CACHE
Note: The XXX_CACHE switches must be entered in the specified order or the
command is rejected.
15. Determine if all data is flushed from the cache module by entering the
following command:
HSGA> SHOW THIS_CONTROLLER