Intel® Raid Smart Battery Axxrsbbu9 - Installation / Removal; Intel® Raid Smart Battery Pre-Installation Considerations; Installing The Intel® Raid Smart Battery; Figure 38. Bbu Unit Connection To The Raid Card - Intel P4304XXMFEN2 Service Manual

Intel ® Server Chassis P4304XXMFEN2/P4304XXMUXX Product Family System Integration and Service Guide
3.4 Intel® RAID Smart Battery AXXRSBBU9 – Installation /
Removal
Intel® RAID (Redundant Array of Inexpensive Disks) Controllers and Intel® Integrated RAID Modules provide
reliability, high performance, and fault-tolerant disk subsystem management. A complete fault-tolerant
strategy requires protection of all data, including the unwritten cached data in the RAM cache. If power is
lost, the data in the RAM cache is lost. To avoid data loss, a battery can be added to supply power to the
RAID RAM during an AC power outage or if the AC power cord is removed.
A battery backup unit (BBU) protects the integrity of the cached data on Intel® RAID Controllers by providing
backup power if there is a complete AC power failure or a brief power outage. The Intel® RAID Smart Battery
Backup Unit provides an inexpensive alternative to using an uninterruptible power supply (UPS) or it can act
as a second level of fault tolerance when used with a UPS.
3.4.1 Intel® RAID Smart Battery Pre-Installation Considerations
Warning: Always ground yourself and/or use a ground strap before touching the RAID controller or the Intel®
RAID Smart Battery AXXRSBBU9. Perform all installation work at an ESDsafe workstation. Use an ESD-safe
Phillips* screwdriver set to a maximum torque of 2.25 inch-pounds, and be sure the screwdriver is centered in
the screw to avoid damaging the screw head. If you exceed the maximum torque specification, you may
damage the board, connectors, or screws, and you will void the warranty of the board.
The batteries in the Intel® RAID Smart Battery AXXRSBBU9 must charge for at least four hours during fast
charge, under normal operating conditions.
To protect your data, Intel recommends that you set the RAID Controller Write Policy to write-through until
the battery unit is fully charged. When the battery unit is charged, you can change the Write Policy to write-
back to take advantage of the performance improvements of data caching.
3.4.2 Installing the Intel® RAID Smart Battery
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Figure 38. BBU Unit Connection to the RAID card