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HSG80 Array Controller V8.7 Maintenance and Service Guide
5–17
Upgrading the Subsystem
NOTE: During the target site upgrade, one of the initiator site controllers could restart with an
instance code of 0xE096980. This potential restart is expected and the associated instance
code can be disregarded.
1. Connect a PC or terminal to the maintenance port of Controller A, at the target
site.
2. Delete any snapshot units using the following commands:
a.
Identify all snapshot units using the following command:
HSGA> SHOW UNITS FULL
b.
Record the configuration for each snapshot unit for later restoration.
c.
Individually delete all snapshot units using the following command:
HSGA> DELETE snapshot-unit-name
3. Verify that all snapshot units were deleted using the following command:
HSGA> SHOW UNITS FULL
IMPORTANT: If any snapshot unit exists, repeat step 3.
4. 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:
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 16.
5. For each unit, identify and record the unit WRITEBACK_CACHE characteristic
using the following command:
HSGA> SHOW UNITS FULL
NOTE: This is modified during the upgrade procedure and must be restored in step 17.
Cache:
256 megabyte write cache, version 0022
Cache is GOOD
No unflushed data in cache
CACHE_FLUSH_TIMER=DEFAULT (10 seconds)