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Chapter 6: Advanced Chassis Setup
3.
SCSI backplane:
All five SCSI drives plug into a single SCSI backplane, which provides
Ultra320 single channel operation for all five SCSI drives. A ribbon cable from
JA1 on the serverboard should be connected to the IN connector on the SCSI
backplane. There is also a power connector on the backplane that must be
connected. See Figure 6-6 for the locations of backplane connectors - the
reverse side of the backplane has five connectors that the SCSI drives plug
into when inserted with a SCSI drive carrier or mobile rack.
Figure 6-6. SC942 SCSI Backplane
IN Connector
Power Connectors
Jumper Settings
JP18: Buzzer Reset, Open: Enabled (default), Closed: Disabled
JP21: SCSI Termination, Closed: Terminated (default), Open: No termination
JP24: SCSI ID Select, Pins 1-2: ID = 0, 1, 2, 3, 4 (default)
Pins 2-3: ID = 9, 10, 11, 12, 13
JP29: Gem318 ID, Pins 1-2: ID = 6 (default), Pins 2-3: ID = 8
JP30: Fan Sense, Pins 1-2: Enabled (default), Pins 2-3: Disabled
LEDs
D3: Overheat/Drive Fail LED
D4: Fan Fail LED
D5, D6, D7, D8, D9: Drive Fail LEDs #1 through #5
D12, D13, D14, D15, D16: Activity LEDs #1 through #5
6-7
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