Acer PCI to Ultra SCSI RAID Controllers DAC960PG - Manual (Page 33)

Manual No. 775012 A-1
Appendix A
Battery Backup Unit Option
Product Description
The Battery Backup Unit (BBU) option is an add-on module that protects the
data in the RAID controller’s cache memory in the event of a power failure.
The battery backup module monitors the write back cache on the
DAC960PG and DAC960PJ and provides power to the cache if it contains
data not yet written to the drives when power is lost. The controller, with the
BBU installed, occupies only one PCI slot on the host backplane.
Features
Some of the new features of the BBU include:
• Gas gauge circuit for battery charge monitoring
• Quick charge to replenish a drained battery
• Support for low-power EDO ECC RAM modules
Figure A-1. BBU Components