Appendix a: memory module and battery backup unit, Product description, Features – Avago Technologies eXtremeRAID 2000 User Manual

Page 41: Appendix a, Memory module and battery backup unit

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Manual No. DB11-000028-00

A-1

Appendix A

Memory Module and

Battery Backup Unit

Figure A-1. BDIMM with BBU

Product Description

The Battery Dual Inline Memory Module (BDIMM) is a cache memory
module that maintains data integrity in the event of a power failure. The
battery backup portion of this module monitors the write back cache on the
eXtremeRAID 2000 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 BDIMM installed, occupies only one PCI slot on the
host backplane.

Features

Some of the features of the BDIMM include:

• Gas gauge circuit for battery charge monitoring

• Quick charge to replenish a drained battery

• SDRAM on the BDIMM module