Apple Workgroup Server 8550 - Manual (Page 65)

4 If you are replacing a drive, slide the drive out of the bay.
5 Confirm that the new drive has its own, unique ID number between 0 and 6.
SCSI ID 2 is recommended for a device in the auxiliary bay. See the section
“Setting the SCSI ID Number” earlier in this chapter for details.
6 Check the termination status of the new drive.
You do not need to terminate a drive installed in the auxiliary bay. The
internal end of internal/external SCSI bus should be terminated already,
either by the termination block at the end of the SCSI ribbon cable or by a
terminated disk drive in the upper bay of the internal disk drive bracket.
Only one internal terminator is allowed on the internal/external SCSI bus. If
the drive that you are installing in the auxiliary bay has a built-in terminator,
and there is no disk drive in the upper bay of the internal disk drive bracket,
you can remove the termination block at the end of the SCSI ribbon cable and
allow the device you are installing to terminate the bus. However, if there is a
disk drive in the upper bay of the internal disk drive bracket, this device is at
the end of the internal SCSI chain and must terminate the bus. In this case,
you should have an Apple-authorized service provider remove any built-in
terminator from the drive that you want to install in the auxiliary bay.
56 Chapter 3 / Expanding Your Server and Connecting Other Equipment