Appendix A

BBM-Battery Backup Module

Figure A-1. BBM Module

Product Description

The Battery Backup Module (BBM) is a battery unit that maintains data integrity in the event of a power failure. The battery backup on this module monitors the write back cache on the AcceleRAID 352 controller, and provides power to the cache if it contains data not yet written to the drives when power is lost.

The controller, with the BBM installed, occupies only one PCI slot on the host backplane.

Features

Some of the features of the BBM include:

•Gas gauge circuit for battery charge monitoring

•Quick charge to replenish a drained battery

Manual No. 775051

A-1