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PERC 3/QC Hardware Installation 145
Step 6—Connect SCSI Cables
Connect SCSI cables to SCSI devices. PERC 3/QC provides two internal
SCSI connectors, J1 (channel 1) and J4 (channel 0), which are the SCSI
channel internal high-density 68-pin connectors for Wide (16-bit) SCSI.
PERC 3/QC provides four external SCSI connectors: J13 (channels 0 and 1)
and J22 (channels 2 and 3), the SCSI channel external ultra high-density
68-pin connectors for Wide (16-bit) SCSI. Only one cable should be
connected to any available channel.
Make sure that pin 1 on the cable is connected to pin 1 on the PERC 3/QC
card. Figure 10-7 displays SCSI cables being connected to the card.
Figure 10-7. Connecting SCSI Cables
Connect SCSI Devices
The cable length should not exceed three meters for Fast SCSI (10 MB/s)
devices or three meters for a four drive Ultra2 SCSI drive system. The cable
length can be up to 12 meters for low-voltage differential (LVD) devices.
The cable length should not exceed six meters for non-Fast SCSI devices.
Perform the following steps to connect SCSI devices:
1 Disable termination on any SCSI device that does not sit at the end of
the SCSI bus.
2 Configure all SCSI devices to supply TermPWR.
3 Set proper target IDs (TIDs) for all SCSI devices.
Pin 1
J1
J4
J13
J22