Apple Workgroup Server 8550 - Manual (Page 109)

Assigning SCSI ID numbers
The two SCSI buses can connect up to eight SCSI devices.
Bus A, the internal Fast SCSI-2 bus, is designed to connect one internal hard
disk drive (the built-in startup drive) to the server (CPU).
Bus B, the internal/external SCSI-1 bus, is designed to connect an optional
secondary internal hard disk (in the upper bay of the internal disk drive
bracket), an optional built-in DAT drive (or other internal drive in the server’s
auxiliary bay), the built-in CD-ROM drive, and up to four additional external
SCSI devices to the server (CPU).
The drives that were installed in your server at the factory, as well as the
server itself, have already reserved certain SCSI ID numbers. Other ID
numbers are available for assignment to SCSI devices that are added after you
buy your server as described in the following table.
SCSI bus SCSI ID number Device
Bus A—Internal (10 MB/sec) 0 internal hard disk #1 (startup disk)
1 not available
2 not available
3 not available
4 not available
5 not available
6 not available
7 server CPU
Bus B—Internal/External (5 MB/sec) 0 available
1 optional internal hard disk #2
2 optional internal drive (DAT)
3 built-in CD-ROM drive
4 available
5 available
6 available
7 server CPU
100 Appendix B / Technical Information