IBM Redbooks ServeRAID-MR10i, User Manual

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ServeRAID-MR10i User’s Guide 5-1
Chapter 5
Installing the Intelligent
Battery Backup Unit
This chapter explains how to install the intelligent Battery Backup Unit
(iBBU) on the ServeRAID-MR10i SAS/SATA Controller.
Attention: Electrostatic discharge can damage the iBBU and the
controller on which it is installed. Always ground yourself
and/or use a ground strap before you touch the controller
or the iBBU. Perform all installation work at an ESD safe
workstation that meets the requirements of EIA-625—
“Requirements for Handling Electrostatic Discharge
Sensitive Devices.” Follow the ESD recommended
practices in the latest revision of IPC-A-610.
The battery in the iBBU must recharge for at least six hours under normal
operating conditions. To protect your data, the firmware changes the
Write Policy to
write-through until the battery unit is sufficiently charged.
When the battery unit is charged, the RAID controller firmware changes
the Write Policy to
write-back to take advantage of the performance
benefits of data caching.
The maximum ambient temperature for battery packs is 0° C to 45° C.
Note: The temperature of the battery pack is typically 15–20
degrees higher than the ambient temperature during fast
charge. For the fast charge circuit to complete a fast charge
cycle, ambient temperature should be less than 40° C. If
the ambient temperature is greater than 40° C, the fast
charge cycle could terminate prematurely.
5.1 Installing the iBBU
on the ServeRAID-MR10i Controller
The iBBU is compatible with systems that offer auxiliary power. Battery
charging and recharging take place automatically. The iBBU mounts