Connecting External Scsi Devices - Sun Microsystems 6500 Installation Manual

2.8

Connecting External SCSI Devices

External SCSI-2 devices connect to your system through the built-in single-ended
Fast/Wide SCSI-2 port on I/O+ boards (except for the board in slot 1), or through
FSBE/S, DSBE/S, SWIS/S, or DWIS/S SBus cards installed on I/O+ boards.
Note – The onboard SCSI-2 bus on the I/O+ board in slot 1 controls internal media
tray devices. Therefore, the external SCSI connector on the I/O+ board in slot 1 must
always have a terminator installed.
Note – The maximum combined length for a string of SCSI cables is 6 meters for
non-differential cables. For differential SCSI cables, the maximum is 25 meters.
When calculating the total length of a SCSI string, include external cables, internal
cables, and printed traces.
servers.
TABLE 2-2
Location
Enterprise 6500 slot 1
Enterprise 5500 slot 1
Enterprise 4500 slot 1
SBus+ I/O board
Graphics+ I/O board
Disk board
For information on device addressing, priorities, and slot assignments, refer to
Appendix D, "Rules for System Configuration" in the Sun Enterprise 6500/5500/4500
Systems Reference Manual, part number 805-2632.
Caution – Do not assign the same SCSI address to two devices sharing the same
SCSI bus or SBus card. Doing so may result in equipment damage.
2-12 Sun Enterprise 6500/5500/4500 Systems Installation Guide • August 2001
TABLE 2-2
Internal SCSI Lengths (Approximate)
Internal Length Comments
3.7 meters Includes I/O+ board traces and cables to media tray
3.7 meters Includes I/O+ board traces and cables to media tray
1.4 meters Includes I/O+ board traces and cables to media tray
0.43 meter Includes board traces only
0.43 meter Includes board traces only
0.64 meter Includes board traces only
lists internal measurements for the Enterprise