Intel AXXRSBBU4 ユーザーズマニュアル
Overview
Intel® RAID Smart Battery AXXRSBBU4 Technical Product Specification
Revision
1.2
Intel order number E20188-002
2
The battery pack charges automatically and communicates battery status information, such as
voltage, temperature, and current to the host computer system.
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.
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
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.
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 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).
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).