Dell 3 - Manual (Page 110)

108 PERC 3/SC Hardware Installation
w
w
w
.d
e
ll
.co
m
|
s
u
p
p
o
rt
.d
e
ll.c
o
m
J16, J17 RUBI Slot Interrupt Steering
J16 and J17 are 3-pin jumpers. You can short them for a one-channel or two-
channel motherboard. The default is OPEN; the pins are not shorted. Table
8-7 shows the settings for shorting J16 and J17.
Step 4—Set SCSI Termination
The SCSI bus is an electrical transmission line and must be terminated
properly to minimize reflections and losses. Termination should be set at
each end of the SCSI cable(s), as shown in the following illustration:
F i g u r e 8 - 2 . E x a m p l e o f S C S I Te r m i n a t i o n
For a disk array, set SCSI bus termination so that removing or adding a
SCSI device does not disturb termination. An easy way to do this is to
connect the PERC 3/SC card to one end of the SCSI cable and to connect
an external terminator module at the other end of the cable. The
connectors between the two ends can connect SCSI devices. Disable
termination on the SCSI devices. See the manual for each SCSI device to
disable termination.
Ta b l e 8 - 7 . J 1 6 , J 1 7 R U B I S l o t I n t e r r u p t S t e e r i n g
Short… For…
Pins 1-2 on both jumpers 2-channel motherboard RAID
Pins 2-3 on both jumpers 1-channel motherboard
Termination on Controller
Enabled
SCSI Devices
(Termination Disabled on Both)
SCSI
Terminator