User`s guide

10 007-4274-001
1: Chassis Description
Warning: The total power requirement for the SGI 1450 server exceeds the 240 VA
energy hazard limit that defines an operator-accessible area. Only qualified service
technicians should access the processor, memory, power subsystem, and non
hot-plug/hot-swap areas of the baseboard.
The power subsystem consists of a power subsystem bay, with up to three power supply
modules. The power subsystem bay contains a power distribution board, which
manages the power delivered by all functional power supplies.
The power subsystem can operate in either a nonredundant or redundant manner.
Nonredundant operation means that you are using only one or two power supply
modules. If a power supply module ceases to function normally, the server system
cannot function properly, if at all. A minimal configuration supported by one power
supply module is one processor, four memory DIMMs, one hard drive slower than 10,000
RPM, one floppy drive, and one CD-ROM.
The SGI 1450 server uses a redundant (2+1) power subsystem. To form a (2+1) redundant
power subsystem, the subsystem parallels the DC output of one power supply module
with one or two other modules. If one module ceases to function normally, the remaining
modules provide power to the server system and the system continues to function
properly. Two power supply modules are required to provide power to a fully configured
SGI 1450 server. The third module provides redundancy. A fully configured system
includes four processors, 8 GB of memory, one floppy drive, one CD-ROM, five hard
drives, and eight PCI add-in boards.
System Cooling
The SGI 1450 server uses up to six fans mounted in a fan board assembly in the middle
of the chassis between the E-Bay and peripheral device bays. The six fans are noted by
“A” in Figure 1-5.
Warning: The total power requirement for the SGI 1450 server exceeds the 240 VA
energy hazard limit that defines an operator-accessible area. Only qualified service
technicians should access the processor, memory, power subsystem, and non
hot-plug/hot-swap areas of the baseboard.