User`s guide

Chapter 2:Software and Hardware Installation
xiv - PShop User’s Guide
SCSI Cable Lengths
If you have a SCSI bus with SCSI-1 and SCSI-2 devices that do not operate in
fast SCSI mode, the bus's total physical cable length should not exceed 6 meters
(19.6 feet). On a bus with fast SCSI devices, the length should not exceed 3
meters (9.8 feet). On a bus with Ultra SCSI (SCSI-3) devices, the length should
not exceed 1.5 meters (4.9 feet). At longer lengths, data integrity and
transmission speed can be degraded significantly. The total cable length must
take into account all external cabling as well as internal cabling in the system
chassis or expansion boxes. Substandard cables will also affect the quality of
transmission at longer lengths. If your cable configuration exceeds the lengths
suggested above, you should either remove a device from your SCSI bus, use
shorter cables to interconnect the components on the bus, or add another SCSI
host adapter to your system. If you have a mixture of devices with different SCSI
transfer speeds on a single bus, the cable length may be different from those listed
above.
Termination
The last device at each end of each SCSI chain must have proper SCSI
termination. An active terminator can be helpful in making a marginal SCSI
configuration more reliable.
General Procedure for Attaching a SCSI Device
You need to power down your system and all attached SCSI peripherals
completely before attaching any SCSI devices.
After you set the printer's ID as described above, re-cable the peripherals on the
SCSI chain to include the printer. Make sure this chain is properly terminated.
Power on all SCSI peripherals, then power on the system. If necessary, take the
appropriate steps to boot your system.
On Solaris 2.x systems, you may need to indicate that the /devices directory links
should be rebuilt at boot time with “boot -r” from the monitor prompt (“ok”) on
SPARC platforms, “b -r” from the secondary OS loader on x86 platforms, or with
a “reboot -- -r” command from the Unix shell. On other systems, the new device
will be recognized automatically by the operating system.
If your system does not boot, power down the system and all SCSI peripherals,
and re-check the cabling, termination, and SCSI ID settings