Chapter 1. Chassis Description

The SGI 1400 server is shipped as either an upright (pedestal mode) unit, or it may be ready for rack mounting (rack mode). Figure 1-1 shows examples of these configurations. Table 1-1 provides the basic physical requirements for the server. Instructions for mounting the server in a rack, are included in Appendix B. Note that the rack installation should be performed by a technically trained or certified installer.

The SGI 1400 family of servers includes products such as the SGI 1400M (which uses a Microsoft Windows operating system), and the SGI 1400L which uses a Linux operating system. While its operating system (OS) gives the server a particular functional interface, the basic hardware functions, diagnostics, and configuration are the same within the SGI 1400 server family. The generic terms “server” and “SGI 1400 server” are used throughout this document, and apply to all systems in the SGI 1400 family of servers.

Table 1-1. SGI 1400 Server Physical Specifications


Pedestal Mode

Rack Mode


48.26 cm (19 inches)



31.12 cm (12.25 inches)

19-inch rack


63.5 cm (25 inches)

25 inches


38.25 kg (85 lbs) minimum configuration
45 kg (100 lbs) maximum configuration

38.25 kg (85 lbs) minimum
45 kg (100 lbs) maximum

Required front clearance

25.4 cm (10 inches) (inlet airflow <35 ˚C / 95 ˚F)

25.4 cm (10 inches) (inlet airflow <35 ˚C / 95 ˚F)

Required rear clearance

20.3 cm (8 inches) (no airflow restriction)

20.3 cm (8 inches) (no airflow restriction)

Required side clearance

0.0 cm/inches (additional side clearance required for service)

N/A (must be removed for side access)

Figure 1-1. Example Rack with Three Servers and Pedestal Server

Chassis Feature Summary

The system's galvanized metal chassis minimizes EMI and radio frequency interference (RFI). The removable access cover is attached to the chassis with three screws. A front subchassis and an electronics bay (at the rear of the main chassis) both rotate outward and can be removed entirely to provide access to internal components. Only trained maintenance personnel should work on the system's internal components.

The removable front panel provides access to the 3.5- and 5.25-inch peripheral bays in the front of the chassis. Table 1-2 lists the main features of the server chassis.

Table 1-2. Chassis Features Summary



Front accessible drives


1.44 MB, 3.5-inch diskette drive, accessible from front subchassis.

CDROM drive.

Expansion capacity:

Two 5.25-inch-wide bays that are externally accessible, designed to hold half-height standard removable media devices.
The externally accessible hard-drive bay holds up to six 1-inch drives.

Expansion slots and covers

Up to eight slot covers can be used; every slot opening that does not have an optional PCI (add-in) board installed must have a slot cover installed.


Form-factor, 16 × 13 inches, ATX I/O.

Power supplies

Three 400-watt power supplies with integrated cooling fans and detachable AC power cords.


A total of 11 internal fans provide cooling and airflow: six system fans inside the chassis, one fan on each of the three power supplies, and two fans for cooling hard drives.

Chassis Front Controls and Indicators

Figure 1-2 shows the server's front controls, option bays, and drives.

Standard front controls include the following:

  • Power On/Off button (holding down this button for more than four seconds causes a power–button override to the PIIX4E when you release the button)

  • Sleep/Service button (holding down this button for less than four seconds enters sleep mode, which requires an ACPI-compliant operating system; holding it down for more than four seconds enters service mode, which powers down the electronics bay but leaves hot-swap and peripheral bays running)

  • Reset button

  • Front panel LEDs (Top to bottom: top five are power on, disk bay power on, hard-drive activity, fan failure, power supply failure; bottom six are hard-drive failure LEDs, labeled 0-5)

  • NMI button

Additional front component features include:

  • A standard Diskette drive

  • A standard CD-ROM drive

  • System security latch

  • EMI shield lock

  • Six internal hard drive bays

  • Two removable media drive bays

    Figure 1-2. Front Controls and Indicators

Chassis Back Controls and Features

Figure 1-3 shows the controls, connectors, and features on the rear of the server.

Figure 1-3. Back Controls and Indicators

Chassis Side View

Figure 1-4 shows a side view of the chassis and locations of key internal components.

Figure 1-4. Chassis Side View

The components shown in Figure 1-4 are listed as follows:

  1. The front swing-out subchassis

  2. Diskette drive

  3. Main chassis

  4. Power backplane

  5. Power supplies

  6. Baseboard (processor board)

  7. Lift-out electronics bay

  8. SCSI hard drives bay

  9. Rear foam cover

  10. Foam fan housing

  11. Foam fan housing cover

  12. Foam rear cover

Server Peripherals Overview

The following sections describe standard and optional peripherals available with the SGI 1400 server system.

3.5-inch Diskette Drive

The 3.5-inch diskette drive in the 3.5-inch peripheral bay supports 720 KB, 1.2 MB, and 1.44 MB media. The drive is externally accessible from the front of the system.

3.5-inch Hard Drive Bays

The chassis contains one hard disk drive bay that holds 3.5-inch-wide (1” high or 1-5/8” high) LVDS SCSI drives with internal cabling. The backplane is hot-swap-capable and can accommodate either six 3.5–inch-wide (1” high) hard drives (or three 1-5/8” high hard disks). The drives are accessed externally from the front of the system. Contact your sales or service representative for information on obtaining additional disks or drive carrier assemblies.

As part of the hot-swap implementation, an integral drive carrier and heatsink assembly is required for the hard disk drives. The drives are mounted in the carrier/heatsink assembly with four screws and the carrier snaps into the chassis. For information on how to install the carrier/heatsink assemblies, see “Mounting a SCSI Hard Disk Drive in a Carrier” in Chapter 5.

A single metal EMI shield and plastic door cover the hard drive bays. Drives can consume up to 22 watts of power and must be specified to run at a maximum ambient temperature of 55 °C.

The system was designed to use an optional Redundant Array of Independent Disks (RAID). A software implementation with onboard SCSI or an add-in board can be used to set up RAID applications. Ask your sales or service representative for information on installation and use of RAID options.

5.25-inch Removable Media Device Bays

The chassis has three 5.25-inch half-height bays that are accessible from the front of the system. These bays are intended to provide space for optional removable media devices.

You can convert the 5.25-inch bays to a single full-height bay. We recommend that you do not use these bays for hard disk drives, because they generate EMI (increasing ESD susceptibility), and because of inadequate cooling. To maintain compliance with electromagnetic compatibility (EMC) regulations, each 5.25-inch drive bay must be configured with either:

  • An EMC-compliant 5.25-inch peripheral device, or

  • A metal cover plate, available from your sales or service representative

Note: Integration of the 5.25-inch peripheral bay can affect EMC compliance and is a regulated activity.

Caution: To avoid damage to a 5.25-inch peripheral device, ensure the EMI gasketing provided in the lower bay does not bridge or short any open circuits of the exposed peripheral device. If the 5.25-inch device has open circuits, install it in one of the two upper bays.

Power Supplies

The chassis comes configured with three 400-watt power supplies, each designed to minimize EMI and RFI. Each supply auto-senses within the following voltage ranges and is rated as follows:

  • 100-120 V~ at 50/60 Hertz (Hz); 7.6 A maximum

  • 200-240 V~ at 50/60 Hz; 3.8 A maximum

The DC output voltages of each power supply are:

  • +3.3V at 36 A max

  • +5V at 24 A max (total combined output of +3.3 V and +5.5 V not to exceed 195 W)

  • +12V at 18.0 A with 19.0 A <10ms peak

  • +24V at 50mA

  • -12V at 0.5 A

  • +5V þstandby 1.5 A

Power is sourced through the power cable to the 20-pin main connectors on the baseboard. Remote sensing signals are provided through the cable to the 14-pin auxiliary connector on the baseboard.

System Cooling

The SGI 1400 server system includes the maximum (6) fan configuration for internal cooling and airflow. There is also one fan for each of the three power supplies, and two fans specifically for cooling the hard drives.

Note: The access cover must be installed on the system for proper cooling.

Chassis Security

For information on security features on the SGI 1400 server, see “System Security” in Chapter 2.