Owner manual

175
APPENDIX
The batteries in the BBM are recharged continuously through a
trickle-charging process whenever the system power is on. The
batteries protect data in a failed server for up to three or four
days, depending on the size of the memory module. Under nor-
mal operating conditions, the batteries last for three years before
replacement is necessary.
• Recovery ROM
The SAS RAID controller rmware is stored on the ash ROM and
is executed by the I/O processor. The rmware can also be up-
dated through the SAS RAID controllers PCIe bus port or Ether-
net port without the need to replace any hardware chips. During
the controller rmware upgrade ash process, it is possible for
a problem to occur resulting in corruption of the controller rm-
ware. With our Redundant Flash Image feature, the controller will
revert back to the last known version of rmware and continue
operating. This reduces the risk of system failure due to rmware
crash.