User`s guide

Installing Optional Disk and Tape Drives
7-5
Storage Backplane
• SBBs must only be installed in the hot-swap bay area.
• A maximum of seven SBBs can be installed.
• Do not mix wide and narrow SBBs on the narrow bus.
• A SCSI ID for each SBB is assigned by the jumper settings on the
storage backplane.
Refer to the Single/Dual SCSI Bus Target ID Settings table in the Drive ID
section.
• The storage backplane is factory-defaulted as one complete
channel on a wide SCSI bus. Split the backplane by removing the
jumper cable between SBBs four and five. Terminate both sides of
the backplane properly.
Drive ID
• The SCSI ID addressing is independent of the single or dual SCSI
bus arrangement. Make sure you select unique SCSI IDs for all
SCSI devices on the SCSI bus.
• You must use a wide SCSI host adapter to set SCSI IDs greater
than seven.
• Your CD-ROM drive and tape drive IDs must be set manually via
jumpers on the device. Refer to your manufacturer’s
documentation for information on setting drive IDs. The factory
installed CD-ROM drive has its SCSI ID set to 6.
• Narrow (8-bit) devices on a wide cable count as two SCSI IDs. For
example, the narrow CD-ROM drive SCSI ID is 6 so SCSI ID 14 is
no longer available. The 8-bit CD-ROM device counts as two
devices on a 16-bit wide data path.
Refer to the Single/Dual SCSI Bus Target ID Settings table for detailed SCSI
ID settings.