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SentinelRAID Installation and Hardware Reference Manual
5-2 Replacing a failed DIMM Module
♦ When replacing any of the controller components, it is necessary to access the
controller board in controller canister. It is recommended that all power to the
controller canister is turned off when maintenance procedures are being carried out.
♦ If the DIMM module, controller board or daughter board fail, the maintenance
operations must be completed as soon as possible.
♦ If either the BBU module or the BBU charger board fail, it is not necessary to
perform maintenance operations immediately. Because all I/O access to the
controller will be shut off for the duration of the maintenance procedure, it is
recommended that you carefully select the time when maintenance operations will
be carried out.
5.2. Replacing a failed DIMM Module
5.2.1 When should a DIMM module be replaced?
There are two instances when a DIMM module should be replaced:
♦ Case 1: DIMM module fails
If a DIMM module fails it must be replaced immediately. The controller cannot
function without a DIMM module and is therefore rendered inoperable. In this
instance, DIMM module replacement becomes a priority and must be replaced as
soon as possible.
♦ Case 2: DIMM module with larger capacity required
If the capacity of the currently installed DIMM module is not sufficient, it can be
replaced with a larger capacity DIMM module. In this instance, it is best to replace
the DIMM module during the least busy time as the controller will have to be
powered down and removed.
5.2.2 DIMM Module Replacement Procedure
Step 1. Power off the controller. Prior to removing the controller module, it is
necessary to power off the controller.
Step 2. Access the controller module. The DIMM module is located on the controller
board. To replace the DIMM module, remove the chassis top cover and open
the chassis. The complete removal procedure is described in Chapter 2,
Section 2.6.2.
Step 3. Remove the optional daughter board. If an optional daughter board has been
installed, it must be removed. The DIMM module is located beneath the
daughter board. See Section 5.4.2 below.