Sun Microsystems 6.0005E+11 User Manual
B-2
Ultra Enterprise 6000/5000/4000 Systems Manual—November 1996
B
B.3 SCSI Cable Length
The maximum combined length for a string of SCSI cables is six meters for
non-differential cables. For differential SCSI cables, the maximum is 25 meters.
non-differential cables. For differential SCSI cables, the maximum is 25 meters.
To calculate the total length of a SCSI string, include external cables, internal
cables, and printed traces. Table B-3 lists measurements for Enterprise servers.
cables, and printed traces. Table B-3 lists measurements for Enterprise servers.
B.4 SCSI Termination
The I/O board in slot 1 of any Enterprise server must be terminated. This slot
connects to the SCSI tray through cables and a connector on the centerplane.
connects to the SCSI tray through cables and a connector on the centerplane.
An I/O board in any other slot does not require termination if no devices
connect to the SCSI bus on that board.
connect to the SCSI bus on that board.
Table B-2
Disk Board Default SCSI Disk Drive ID Numbers
Board Slot
Disk 0,1
Board Slot
Disk 0,1
0
4,5
1
6,7
2 or 14*
0,1
3 or 15*
10,11
4
2,3
5
12,13
6
8,9
7
14,15
*Enterprise 6000 systems: Disk boards can only be installed in slots 14 and 15.
Table B-3
Internal SCSI Lengths (Approximate)
Location
Internal Length
Comments
Enterprise 6000 slot 1
3.7 meters
Includes I/O board traces and cables to SCSI tray
Enterprise 5000 slot 1
3.7 meters
Includes I/O board traces and cables to SCSI tray
Enterprise 4000 slot 1
1.4 meters
Includes I/O board traces and cables to SCSI tray
SBus I/O board
0.43 meter
Includes board traces only
Graphics I/O board
0.43 meter
Includes board traces only
Disk board
0.64 meter
Includes board traces only