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Battery-backed write cache option

NOTE: This feature applies only to SCSI models.

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. 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 "Battery-backed write cache LEDs" and "Battery-backed write cache LED statuses."

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 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 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.

To install the BBWC:

  1. Power down the server.
  2. Extend the server from the rack, if applicable.
  3. Remove the access panel.
  4. Remove the front fan bracket.
  5. Remove the PCI riser cage.
  6. Connect the cable to the cache module and install the cache module.

    Installing memory module

  7. Route the cable along the system board.
  8. Install the battery pack assembly into the server.

    Installing a BBWC enabler

  9. Install the PCI riser cage.
  10. Install the front fan bracket.
  11. Install the access panel.
  12. Power up the server.

Refer to the option documentation for more information.