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SentinelRAID Installation and Hardware Reference Manual
5-4 Replacing a Failed Optional BBU Module
Step 7. Reinstall the optional BBU charger board. Once the new DIMM module is
installed, if an optional BBU charger board was previously removed it can
now be reinstalled onto the controller board. See Section 5.3.3 below.
Step 8. Reinstall the optional daughter board. Once the optional BBU charger board
has been reinstalled, if an optional daughter board was previously installed on
the controller board, it too can be reinstalled. See Section 5.4.2 below.
Step 9. Replace the chassis top cover. Once the DIMM module, optional BBU
charger board and optional daughter board have all been reinstalled, the
chassis top cover must be reinstalled. For detailed instructions on how to
reinstall the chassis top cover, please refer to Section 2.6.2.
5.3. Replacing a Failed Optional BBU Module
5.3.1 About BBU Maintenance
Maintaining the BBU requires that two items be maintained:
♦ BBU battery pack: The BBU battery pack contains the cells that provide power to
the memory cache during a power outage. The battery pack is connected to the
battery charger board or the connector at the back of the controller board. It is
important that the BBU battery pack is replaced every two years.
♦ BBU charger board: The BBU charger board is installed on the controller board.
The charger board keeps the battery pack charged so that the BBU can support the
cache memory during a power outage.
If either of these components fails, it will have to be replaced.
5.3.2 BBU Battery Pack Replacement
5.3.2.1 Case 1: BBU Battery Pack Connected to the Controller
Board Backplane Connector
If the BBU battery pack is attached to the connector on the rear of the controller board,
the cable attached to this connector must be removed and the connector on the
replacement battery pack connected. (See Figure 5-3)