Dell PowerEdge 2550 - Manual (Page 76)

SCSI ID Numbers
Each device attached to a SCSI host adapter must have a unique SCSI ID number from 1 to 7.
When SCSI devices are shipped from Dell, the default SCSI ID numbers are assigned as follows:
l A SCSI tape drive is configured as SCSI ID 6 (the default ID number for a tape drive).
l A SCSI CD-ROM drive is usually configured as SCSI ID 5.
Device Termination
SCSI logic requires that the two devices at opposite ends of the SCSI chain be terminated and that all devices in between be unterminated. The SCSI cable
included in the upgrade kit has an active terminator installed at the end of the cable. Therefore, you should disable the termination on all SCSI devices you
attach to this cable.
Installing a Device That Uses the System's Integrated SCSI Controller
To install a peripheral device (such as a tape drive) that uses the system's integrated SCSI controller, perform the following steps.
1. Turn off the system, including any attached peripherals, and disconnect the system from the electrical outlet.
2. Prepare the drive for installation.
Ground yourself by touching an unpainted metal surface on the back of the system, unpack the drive, and compare the jumper and switch settings with
those in the drive documentation. (See "
SCSI Configuration Information " for information on setting the drive's SCSI ID number and enabling termination,
if required.) Change any settings necessary for this system's configuration.
If the drive does not already have drive rails attached, attach a drive rail to each side of the drive with a screw in each of the lower slotted screw holes
on the drive rail.
3. Open the system doors (see " Opening the System Doors " in "Checking Inside the System").
4. Disconnect all cables connected to the interposer board on top of the peripheral bay (see Figure 9 -2 and Figure 9 -3 ).
These cables include the system board interface cable, cooling fan wiring harness, interposer board power cable, and control panel cable.
Figure 9-2. Connectors on the Interposer Board
5. Loosen the thumbscrew at the back corner of the peripheral cage (see Figure 9 -3 ).
Figure 9-3. Installing a Drive in the Peripheral Cage
NOTE: There is no requirement that SCSI ID numbers be assigned sequentially or that devices be attached to the cable in order by ID number.
WARNING: Before you perform the procedures in this section, you must turn off the system and disconnect it from its electrical outlet. For more
information, see "
Safety First—For You and Your Computer " in "Checking Inside the System."
WARNING: See "Protecting Against Electrostatic Discharge" in the safety instructions in the System Information document.