Intel AXXRSBBU4 Datasheet download pdf (Page 6)

Overview Intel® RAID Smart Battery AXXRSBBU4 Technical Product Specification

Revision 1.2

Intel order number E20188-002

The battery pack charges automatically and communicates battery status information, such as

voltage, temperature, and current to the host computer system.

Because it is faster to write data to the RAID adapter’s cache memory than it is to write it

directly to a storage device, data is first written to the cache memory. These write operations are

completed quickly at the software application level. The RAID controller then writes the cached

data to the storage device when system activity is low or when the cache is full.

This method of writing data carries a risk. Cached data on the RAID controller can be lost if the

AC power fails before the data is written to the storage device. The Intel

RAID Smart Battery

AXXRSBBU4 mitigates this risk by providing battery power to the RAID controller if AC power is

lost.

The Intel

RAID Smart Battery AXXRSBBU4 monitors the voltage level of the DRAM modules

on the RAID controller. If the voltage drops below a predefined level, the Smart Battery switches

the memory power source from the RAID controller to the battery pack. The battery pack

provides power for the memory until the voltage returns to an acceptable level, at which time the

Smart Battery circuit board switches the power source back to the RAID controller. Cached data

is then written to the storage devices with no loss of data. The Smart Battery provides additional

fault tolerance when used with a UPS.

The battery pack cache-memory hold time depends on the size and configuration of the RAID

controller memory. Retention time depends on memory capacity and the number of memory

components on the DIMM to support the capacity. An estimated battery backup retention time is

72 hours (three days).

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Intel AXXRSBBU4 Datasheet Page 6