Chapter 5: Subsystem Maintenance and Upgrading
5.2.2Notes on Controller Module Maintenance
The controller module contains a DIMM module for cache buffer. When replacing the controller module, the DIMM module can be removed and used on the replacement controller if they are known to be good.
When replacing the controller module, you must remember that the controller board is one of the most sensitive components in the EMD SS16I subsystem. All previously stipulated safety precautions (see Chapter 2) must be strictly adhered to. Failure to adhere to these precautions can result in permanent damage, resulting in timely delays.
For your own safety and that of the subsystem, make sure that no power is being supplied to the system prior to replacing the controller module.
5.2.3Removing the Controller Module
To remove the controller module:
Step 1. Prepare a clean,
Step 2. Make sure there is no data access to the subsystem to avoid losing data. Stop all I/O accesses to the subsystem and make sure all cached writes have been distributed to disk drives.
Step 3. Power off the subsystem. If possible, power off the subsystem in the way described in Chapter 4. Be sure to flush all cached data before powering off the subsystem. If it is not possible to do this turn off both PSU modules and disconnect the power cords.
Step 4. Disconnect all cables that are connected to the controller module you wish to replace. These include the Ethernet cables connected to the network, and any cable connected to the
Step 5. Remove the BBU module if one has been installed. Loosen the BBU module’s retention screws and then retrieve it from the chassis.