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Chapter 1 General Information 1
1 General Information
This manual provides general installation and maintenance information, including drive
installation and power supply replacement for the Megaplex II 4U chassis.
General Description of Chassis
The Megaplex II rack-mount chassis supports up to three 3.50" SCA (Single Connector
Attachment) Low Voltage Differential (LVD) 16-bit SCSI drives. SCA drives provide simple
installation via pluggable canisters. The SCA “no cable” design allows you to simply mount the
drive into the canister and plug into the chassis. The Megaplex II chassis includes:
• mounts for up to three drives,
• mounts for up to three power supplies,
• five cooling fans,
• four CPU activity LEDs
• three SCSI activity LEDs, and
• an Alarm Mute switch.
Peripheral Drives System peripherals include mountings for:
• one 5.25" half-high CD-ROM drive,
• one 3.5" floppy drive, and
• one 3.5" IDE (internal system drive.)
Power Supplies The chassis is supported by three 440W hot-pluggable power supplies. The N+1 redundant
arrangement allows the chassis to continue operation when one power supply fails. The power
supply is a modular, pluggable design. Power supplies are mounted from the rear of the chassis.
Each power supply plugs into the chassis power distribution board via a blind mate connector. The
power supplies are hot-pluggable units that can be replaced while the system remains operational.
Cooling Cooling is provided by three fans in the front of the chassis, and two fans in the middle (in an
assembly.)