Installation guide

Manual No. DB11-000033-00 A-1
Appendix A
Memory Module and
Battery Backup Unit
Figure A-1. BDIMM Module
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 3000 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