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146 PERC 3/QC Hardware Installation
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Cable Suggestions
System throughput problems can occur if SCSI cable use is not maximized.
You sh ou ld:
• Use cables up to 12 meters for LVD devices.
• For single ended SCSI devices, use the shortest SCSI cables (no more
than 3 meters for Fast SCSI, no more than 1.5 meters for an 8-drive
Ultra2 SCSI system and no more than 3 meters for a 6-drive Ultra2
SCSI system.)
• Use active termination.
• Use only Dell-approved cables.
Step 7—Set Target IDs
Set target identifiers (TIDs) on the SCSI devices. Each device in a specific
SCSI channel must have a unique TID in that channel. See the
documentation for each SCSI device to set the TIDs. The PERC 3/QC
controller automatically occupies TID 7 in the SCSI channel. Eight-bit
SCSI devices can only use the TIDs from 0 to 6. 16-bit devices can use the
TIDs from 0 to 15. The arbitration priority for a SCSI device depends on its
TID.
Step 8—Power on Host System
Replace the computer cover and reconnect the AC power cords. Turn power
on to the host computer. Set up the power supplies so that the SCSI devices
are powered up at the same time as or before the host computer. If the
computer is powered up before a SCSI device, the device might not be
recognized.
During boot, the PERC 3/QC BIOS message appears:
PowerEdge Expandable RAID Controller BIOS Version x.xx
date
Copyright (c) Dell Computer Corporation
Table 10-8. Target IDs
Priority Highest Lowest
TID 765...2101514...98