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14 Sun StorEdge PCI/PCI-X Dual Ultra320 SCSI Host Adapter Installation Guide • January 2007
Bus Length
The maximum SCSI bus length is determined by the SCSI bus type (that is, the
number of devices connected).
Table A-1 shows the maximum SCSI bus lengths for Ultra320 SCSI with a 8/16-bit
bus width.
TABLE A-1 Bus Restrictions
SCSI Type Peak
MBytes
/sec
Single-Ended LVD
Max Length
*
* This maximum length (shown in meters) must include the internal bus length of your system. Sun qualifies
cable lengths of only up to 10 meters (22.8 feet).
No. of Devices Max Length
*
No. of Devices
SCSI-2
Narrow
Wide
10
20
3
3
8
16
25
12
25
12
2
8
2
16
SCSI-3 Ultra1
Narrow
Wide
20
40
1.5
3
1.5
3
8
4
8
4
25
12
25
12
2
8
2
16
SCSI-3 Ultra2
Narrow
Wide
40
80
N/S
\
N/S
\ N/S = not supported
N/S
N/S
25
12
25
12
2
8
2
16
SCSI-3 Ultra3
Narrow
Wide
80
160
N/S
N/S
N/S
N/S
25
12
25
12
2
8
2
16
SCSI-3 Ultra320
Narrow
Wide
160
320
N/S
N/S
N/S
N/S
25
12
25
12
2
8
2
16