HP ProLiant DL580 G3 Server - Manual (Page 73)

Hardware options installation 73
7.
Be sure that the front panel external health LED is green ("Front panel LEDs
and buttons" on page 11 ).
IMPORTANT: For maximum server availability, be sure that the
two power supplies are powered by separate AC power sources.
NOTE: If the server will be shipped to another location after
configuration, install a shipping screw into each power supply.
Battery-Backed Write Cache
Along with the cache module, the battery pack provides transportable data
protection, increases overall controller performance, and maintains any cached
data for up to 72 hours after the server loses power. The NiMH batteries in the
battery pack are continuously recharged through a trickle-charging process
whenever the system power is on.
For information on BBWC LEDs, refer to "BBWC LEDs (on page 35 )."
CAUTION: To prevent a server malfunction or damage to the
equipment, do not add or remove the battery pack while an array
capacity expansion, RAID level migration, or stripe size migration is in
progress.
CAUTION: After the server is powered down, wait 15 seconds and
then check the amber LED before unplugging the cable from the cache
module. If the amber LED blinks after 15 seconds, do not remove the
cable from the cache module. The cache module is backing up data,
and data will be lost if the cable is detached.
IMPORTANT: The battery pack may have a low charge when
installed. In this case, a POST error message is displayed when the
server is powered up, indicating that the battery pack is temporarily
disabled. No action is necessary on your part. The internal circuitry
automatically recharges the batteries and enables the battery pack. This
process may take up to 4 hours. During this time, the cache module will
function properly, but without the performance advantage of the battery
pack.
NOTE: The data protection and the time limit also apply if a power
outage occurs. When power is restored to the system, an initialization
process writes the preserved data to the hard drives.
To install the BBWC battery pack and cache module: