Silicon Graphics 1200, User Manual

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Chassis Tour
007-4248-001 11
• hard drive not spinning
• hard drive not responding to low level SCSI commands
Figure 2-5 shows the SCSI IDs that the midplane assigns. The midplane itself uses SCSI
ID 9.
Figure 2-5 Midplane-Assigned SCSI IDs
Temperature sensors on the right and left side of the midplane monitor the chassis
temperature. When the sensors detect internal chassis temperatures above 50 degrees C
(equipment damaging conditions), the midplane issues a signal that causes the amber
Global Failure LED on the front panel to light.
The chassis fans are also monitored, and a fan failure causes the Global Failure LED to
light.
Chassis Tour
Figure 2-6 shows some of the main chassis components in an exploded view. They are:
• Front drive cover
• Hot swappable SCA hard drives
SCSI ID 1
SCSI ID 2
SCSI ID 3
SCSI ID 4
Midplane is SCSI ID 9