BBM-Battery Backup Module

Maintenance

No maintenance is required. It is recommended that the BBM charge level be periodically checked using the Gas Gauge function in GAM (see the Global Array Manager Client Software Installation Guide and User Manual).

Removing the BBM

The BBM only needs to be removed if the Lithium-Ion battery no longer accepts a charge properly (Lithium-Ion battery life expectancy is approximately 1-1/2 years), or if the BBM is being salvaged from a controller that has failed.

￿WARNING

For battery service, please contact Mylex or your authorized dealer for repairs. Batteries are not user serviceable or replaceable.

BBM Functional Description

Whenever the system is running, the BBM’s battery backup circuitry is standing by, monitoring the voltage level supply of 3.3 V. In the event of a power failure, the supply voltage level will begin to drop. When the battery backup circuitry detects this voltage drop, it checks the status of the disk cache. If the cache is empty, the battery backup circuitry does nothing.

If the cache contains data during a power failure, the BBM’s battery backup circuitry will maintain cache data integrity until the power is restored. When power is restored and the system finishes the bootstrap process, the cache contents will be written to the disk array, also known as FLUSH.

Manual No. 775051

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