HP ProLiant BL620c G7 Server-Blade - Manual (Page 51)

Hardware options installation 51
Controller options
The server blade ships with an embedded Smart Array P410i Controller. RAID 0 and 1 are supported and
do not require a cache module to be installed. Upgrade options exist for the integrated array controller. For
a list of supported options, see the QuickSpecs on the HP website ( http://www.hp.com/support ).
The server blade supports both of the following options. You can install up to two cache modules in any
combination.
• BBWC options
BBWC consists of a cache module and a battery pack (also called a BBWC enabler). The DDR cache
module buffers and stores data being written by the controller. When the system is powered on, the
battery pack continuously recharges through a trickle-charging process lasting 15 minutes to 2 hours,
depending on the original charge. In the event of system power failure, a fully charged battery pack can
maintain the cached data for up to 72 hours. BBWC is available through optional Smart Array
mezzanine controllers.
• FBWC options
FBWC consists of a cache module and a capacitor pack. The DDR cache module buffers and stores
data being written by the controller. When the system is powered on, the capacitor pack charges fully
in about 5 minutes. In the event of a system power failure, a fully charged capacitor pack provides
power for up to 80 seconds. During that interval, the controller transfers the cached data from DDR
memory to flash memory, where the data remains indefinitely or until a controller retrieves the data.
FBWC is available as an optional upgrade to the embedded P410i Controller or through optional
Smart Array mezzanine controllers.
CAUTION: Do not use this controller with cache modules designed for other controller models,
because the controller can malfunction and you can lose data. Also, do not transfer this cache
module to a different controller module, because you can lose data.
CAUTION: To prevent a server blade 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 blade 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 is lost if the cable is detached.
IMPORTANT: The battery pack might have a low charge when installed. In this case, a POST
error message is displayed when the server blade 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 might take up to four hours.
During this time, the cache module functions 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.
Installing a cache module