4-2 Sun StorEdge 3000 Family FRU Installation Guide • May 2004
4.1 Battery Operation
Your lithium ion battery should be changed every two years if the unit is
continuously operated at 25 degrees C. If the unit is continuously operated at 35
degrees C or higher, it should be changed every year. The shelf life of your battery is
three years.
In the event of a power failure, the battery maintains power to the cache for 72
hours. When power is restored, the data in cache is dumped to disk.
Note – The RAID controller has a temperature sensor which shuts off battery
charging above 54 degrees C. When this happens, the battery status may be reported
as BAD, but no alarm is written to the event log since no actual battery failure has
occurred. This behavior is normal. As soon as the temperature returns to the normal
range, battery charging resumes and the battery status is reported correctly. It is not
necessary to replace or otherwise interfere with the battery in this situation.
The battery LED (on the far right side of the controller module) is an amber LED if
the battery is bad or missing. The LED blinks green if the battery is charging and is
solid green when the battery is fully charged.
4.2 Battery Status on the Initial Firmware
Screen
The initial firmware screen displays the battery status at the top of the initial screen
where BAT: status displays somewhere in the range from BAD to ----- (charging), or
+++++ (fully charged).
For maximum life, lithium ion batteries are not recharged until the charge level is
very low, indicated by a status of -----. Automatic recharging at this point takes very
little time.
A battery module whose status shows one or more + signs can support cache
memory for 72 hours. As long as one or more + signs are displayed, your battery is
performing correctly.
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