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

Upgrading the Subsystem
198 HP StorageWorks HSG60 and HSG80 Array Controller and Array Controller Software
Maintenance and Service Guide
9. Determine if all data is flushed from the cache module by entering the
following commands:
HSGA> SHOW THIS_CONTROLLER
HSGA> SHOW OTHER_CONTROLLER
Figure 86 shows only a portion of the resulting display—an arrow points to
the pertinent status indication.
Figure 86: Screen display indicating whether flushed data remains in cache
10. Repeat step 9 on both controllers until no unwritten data remains in either
cache module memory.
11. If unwritten data is present after several minutes, verify that writeback cache
was disabled on all units by entering the SHOW UNITS
FULL command. For
any units with writeback cache enabled, return to step 6 on page 197 and
proceed.
12. Shut down controller B by entering the following command:
HSGA> SHUTDOWN OTHER_CONTROLLER
Note: Disregard any messages pertaining to misconfigured controllers or failover
status.
Note: After controller B shuts down, the Reset button and the first three LEDs turn on
(see Figure 82 on page 192). Proceed only after the Reset button stops flashing and
remains on.
13. Verify that all units failed over to controller A by entering the following
command to show the status of each unit:
HSGA> SHOW UNITS FULL
Cache:
256 megabyte write cache, version 0022
Cache is GOOD
No unflushed data in cache
CACHE_FLUSH_TIMER=1 SECOND