The hard disk drive module is the removable metal framework which holds up to four hard disk drives. The Shogun disk subsystem can accommodate up to five of these modules. Removal of a module will usually only be necessary if the circuit boards on the module backplane fail.

Removing

1. Remove all hard disk drives which may be fitted to the module in question.

2. In the electronics chamber, unplug the data ribbon cable from the connector on the back of the module. The connector is visible through an opening in the centre spine.

3. Remove the four securing screws, as shown:

4. Slide the module gently out. You will feel the backplane power connector unplug from the socket on the centre spine of the server.

Fitting

1. Remove the knockout panel (first time only) which covers the drive module data connector opening in the centre spine of the server.

2. Slide the drive module into place, guiding the data connector through the opening in the centre spine. You will feel the module snap into place as the power connector on the backplane plugs into the socket on the centre spine.

3. Use the four screws to fasten the module to the subsystem metalwork.
4. In the electronics chamber, plug the appropriate ribbon cable onto the data connector on the backplane of the drive module:

It has been found that when fitting the fifth module it is easier to install when the forth module is removed. Install the fifth module and then re-install the forth module.

Hard Disk Drive Module Backplane

The backplane on a hard disk drive module consists of up to seven small circuit boards which are fastened with screws to the metal framework and connected to each other by a flexible ribbon cable.

Removing

There are two fastening screws for each board except the removable media drive SCSI interface board, which has four. To remove the backplane:

1. Remove all disk drives from the module.
2. Remove the fastening screws from all the boards.
3. Push each of the boards, except the data connector board, towards the interior of the module and manoeuvre it as necessary until it can be freed from the framework.
4. Lift the backplane away.

Fitting

1. Manoeuvre the boards of the backplane through the back openings into the interior of the framework so that they can be positioned properly.
2. Fasten all the boards to the module framework as shown in the diagram above.