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J16, J17 RUBI Slot Interrupt Steering

J16 and J17 are 3-pin jumpers. You can short them for a one-channel or two- channel motherboard. The default is OPEN; the pins are not shorted. Table 8-7 shows the settings for shorting J16 and J17.

Ta b l e 8 - 7 . J 1 6 , J 1 7 R U B I S l ot I n t e r r u p t S t ee r i n g

Short…

For…

 

 

Pins 1-2 on both jumpers

2-channel motherboard RAID

 

 

Pins 2-3 on both jumpers

1-channel motherboard

 

 

Step 4—Set SCSI Termination

The SCSI bus is an electrical transmission line and must be terminated properly to minimize reflections and losses. Termination should be set at each end of the SCSI cable(s), as shown in the following illustration:

F i g u r e 8 - 2 . E xa m pl e o f S C S I Te r m i n at i on

SCSI

Terminator

Termination on Controller

SCSI Devices

Enabled

(Termination Disabled on Both)

For a disk array, set SCSI bus termination so that removing or adding a SCSI device does not disturb termination. An easy way to do this is to connect the PERC 3/SC card to one end of the SCSI cable and to connect an external terminator module at the other end of the cable. The connectors between the two ends can connect SCSI devices. Disable termination on the SCSI devices. See the manual for each SCSI device to disable termination.

108

PERC 3/SC Hardware Installation

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Dell 3 manual Set Scsi Termination, J16, J17 Rubi Slot Interrupt Steering, 108