Chapter 3. SGI 1400 Server SCSI Backplane Installation

SCSI Backplane Warnings and Cautions

The warnings and cautions listed a the beginning of Chapter 1 apply whenever you remove the access cover of the system. Only a technically qualified person should perform the upgrade installation described in the following sections. Also see Chapter 1 for a list of tools to use.

Safety: Before You Remove the Access Cover

Before removing the access cover at any time to work inside the system, observe these safety guidelines.

  1. Turn off all peripheral devices connected to the system.

  2. Turn off the system by using the push-button on/off power switch on the front of the system.

  3. Unplug all AC power cords from the system or wall outlet.

  4. Label and disconnect all peripheral cables and all telecommunication lines connected to I/O connectors or ports on the back of the system.

  5. Provide some ESD protection by wearing an antistatic wrist strap attached to chassis ground of the system—any unpainted metal surface—when handling components.

General Procedure to Open the Chassis

  1. Label and disconnect all peripheral cables and all telecommunication lines connected to I/O connectors or ports on the back of the system. Unplug all AC power cords from the system and wall outlet.

  2. Remove the access cover, see Figure 3-1.

  3. Remove the front foam/fan assembly and rear foam cover.

  4. Open the front subchassis.

  5. Proceed to the next section to replace the SCSI backplane.

    Figure 3-1. Chassis Side View


Components listed in Figure 3-1 are:

  1. Front swing-out subchassis

  2. Diskette drive

  3. Main chassis

  4. Power share board

  5. Power supplies

  6. Baseboard

  7. Lift-out electronics bay

  8. 5.25-inch device bay

  9. SCSI hard drive bay: backplane mounts to rear of bay

  10. Foam cover

  11. Foam fan housing

  12. Foam fan housing cover

Replacing an Existing Backplane

  1. Remove the existing SCSI hard drive(s) from the hot-docking bay.


    Note: If the backplane has optional RAID support you must label and return all drives to their original locations.


  2. Undo the three screws that hold the chassis access cover in place and remove it.

  3. Label and disconnect all cables attached to the existing backplane.

  4. Remove and save the three screws that attach the upper edge of the backplane to the chassis.

  5. Slide the backplane out from the three clips that attach its lower end to the chassis.

  6. Remove the backplane and set it aside on an antistatic surface or conductive foam pad.

  7. Attach the new backplane to the chassis by first sliding the lower end into the three clips, then using the three screws you removed earlier to attach the upper end.

  8. Reconnect cables (removed in step 3) to the new backplane.

  9. Replace all screws and covers.

  10. Plug all drives back into the bay before powering the system on.

    Figure 3-2. Removing the Backplane from the Chassis


Components shown in Figure 3-2 are:

  1. Attachment screw locations

  2. Backplane mounting notches

    Figure 3-3. Aligning and Attaching the Backplane


Components shown in Figure 3-3 are:

  1. Backplane mounting notches

  2. Backplane SCSI connector

  3. Attachment screw locations

    Figure 3-4. Reconnecting Cables to the New Backplane


Locations shown in Figure 3-4 are:

  1. Front panel cable

  2. Peripheral power cable

  3. SCSI Cable

General Procedure to Close the Chassis

Follow these steps after you have finished the procedure described in the previous sections.

  1. Close the front subchassis.

  2. Reinstall the front and rear foam covers.

  3. Reinstall the access cover using the original screws.

  4. Reinstall the existing and/or new power supplies.

  5. Reconnect all AC power and peripheral device cables to the rear of the system and to wall outlets.

  6. Run the FRUSDR load utility to properly configure the system after adding new components. See Chapter 3 of the SGI 1400 Server Family User's Guide.