Chapter 5. Installing or Replacing Drives and Power Supplies

SCSI Hard Disk Drives

The system supports a variety of low-voltage differential (LVD) and single-ended SCSI devices. As shipped from the factory, the system might contain only a single hard disk drive (sometimes called the “system disk”). Contact your sales or service representative for a list of optional approved SCSI devices.


Caution: Electrostatic discharge (ESD): ESD can damage disk drives, add-in boards, and other components. The server can withstand normal levels of environmental ESD while you are hot-swapping SCSI hard disk drives. However, we recommend doing all procedures in this manual only at an ESD-protected workstation. If one is not available, you can provide some ESD protection by wearing an antistatic wrist strap attached to chassis ground of the server—any unpainted metal surface—when handling components.


Mounting a SCSI Hard Disk Drive in a Carrier

The SGI 1400 servers use an integrated drive sled and heatsink assembly for installing hard disks into the server. If you plan to use SCSI drives whose power exceeds 15 watts, you must have heatsinks on those drives.

  1. Remove the 3.5-inch hard drive from its wrapper and place it on an antistatic surface.

  2. Record the drive model and serial number in your equipment log.

  3. Orient the drive so the connector is near the top surface of the drive, then place the plastic carrier and heatsink assembly on top of the drive (Figure 5-1).

  4. Using four screws of the correct size and length, attach the carrier to the drive.

    Figure 5-1. Mounting the Carrier and Heatsink Assembly to the Hard Disk Drive


Hot-swapping a SCSI Hard Disk Drive

A bank of six yellow LEDs on the front panel monitors the drive status of each drive in the hot-docking bay. Each LED corresponds directly to a drive, so that the upper-most LED reflects activity in the upper-most drive. The six LEDs and corresponding drives are numbered (top to bottom) zero through five. When a yellow LED is on continuously, it is okay to hot-swap (replace) a bad drive with a good one. You DO NOT need to shut the system down to hot-swap a drive.

  1. Open the front bezel by rotating its right side out and to the left.

  2. If you installed a padlock on the metal door to the bays, unlock the padlock and remove it.

  3. Loosen the plastic latch securing the metal door to the chassis, and open the door.

  4. Check the bank of yellow LEDs on the front panel to determine which drive is bad.

  5. Press the rounded tab (callout 2 in Figure 5-2) in on the right of the carrier to the left (toward the center of the drive) while gently pulling straight down on the carrier handle (callout 1 in Figure 5-2). This disengages the latch that secures the carrier to the chassis.

  6. Grasp the plastic carrier handle and pull it toward you to disengage the drive connector from the backplane connector.

    Figure 5-2. Disengaging Drive Carrier from Chassis


  7. Carefully slide the bad drive forward out of the bay. Place the drive on an antistatic surface.

  8. Position the new plastic carrier and drive assembly so that it engages the bay guide rails.

  9. Gently push the new drive into the bay. To engage the latch, the carrier handle should be approximately at a 45° angle from the vertical front of the chassis. As you push the drive into the bay, the two rounded notches in the carrier handle slide onto the two round pegs inside the drive bay (see Figure 5-3). When they engage, push the handle straight up to lock the notches onto the pegs and press the rounded tab on the right of the carrier to the left until it clears the edge of the bay and snaps into place.

  10. Close the metal door, and secure it to the chassis with the plastic latch.

  11. For security and to prevent unauthorized access to the bays, insert a padlock through the metal loop protruding through the door.

  12. Close the front bezel.

    Figure 5-3. Installing a New Drive


  13. Round peg inside drive bay

  14. Round notches on carrier handle (must fit over pegs in drive bay)

  15. Carrier handle

Removing or Installing a Power Supply

The SGI 1400 server comes standard with three power supplies. All three should be plugged in to provide your system with high availability. If one power supply fails, the server will continue to run uninterrupted. The SGI 1400 server also comes with a power share board (PSB). The PSB supports one to three supplies. Never replace the power share board with a power distribution board (which is intended to work in systems using one power supply only). Power share boards should only be replaced by trained installers. Information on replacing PSBs is included in the SGI 1400 Server Family Maintenance and Upgrades Guide.


Caution: Hazardous voltage, current, and energy levels are present inside the power supply. There are no user–serviceable parts inside it; servicing should be done by technically qualified personnel only.


Removing a Power Supply

  1. Disconnect the AC power cable from the system.

  2. Remove the four screws holding the power supply to the back of the chassis.

  3. Using the flared, vertical edges as handles, slide the supply straight back from its bay (Figure 5-4 shows an example).


Caution: You might feel initial resistance in sliding the power supply from its bay. Do not tilt or twist the supply; this can damage components. Resistance is caused by the supply disengaging from its 40-pin connector. Use even, steady force to remove the supply.

Figure 5-4. Removing a Power Supply


Installing a Power Supply

Use the following steps to install a new power supply into the server.

  1. Slide the power supply into its bay.

  2. With even force on the flared, vertical edges, push toward the front of the system until the edges rest against the rear of the chassis and the supply engages its connector.

  3. Install and tighten the four screws holding the supply to the back of the chassis.

  4. Install the access cover.

  5. Connect the AC power cable. You must slide the cover on the AC connector to access the connector itself.

  6. Run the FRUSDR load utility to properly configure the system after adding new components, see “Sensor Data Record (SDR) Manager Add-In” in Chapter 3.