General Procedure For Installing Scsi Devices; Figure 7-15. Internal Scsi Cable - Dell OptiPlex Gs Reference And Installation Manual

cable goes to
SCSI host
adapter card

Figure 7-15. Internal SCSI Cable

•
If you have an external SCSI device, you have a
shielded external cable that connects to the external
SCSI connector on the SCSI host adapter card. You
have a separate power cable to connect the SCSI
device to power.
Before installing SCSI devices in your computer, you
must configure the termination on your SCSI device(s) to
conform to the guidelines that follow.
NOTE: The SCSI host adapter card is shipped with termi-
nation enabled.
•
If only one SCSI device is installed internally, con-
nect the device as follows:
— Attach the end connector on the internal SCSI
cable to the SCSI device, and leave the
termination enabled on the SCSI device.
— Attach the other end connector on the internal
SCSI cable to the SCSI host adapter card, and
leave the termination enabled on the adapter
card.
•
If two SCSI devices are installed internally, connect
the devices as follows:
— Attach one of the devices to one of the end
connectors on the SCSI cable, and leave the
termination enabled on that device.
SCSI device in 5.25-inch drive bay
SCSI device in
hard-disk drive bracket
— Attach the other end of the SCSI cable connec-
tor to the SCSI host adapter card, and leave the
termination enabled on the adapter card.
— Disable the termination for the other device you
attach to the cable.
•
If both internal and external SCSI devices are
attached to the SCSI host adapter card, connect the
devices as follows:
— Attach an end connector on the internal SCSI
cable to the internal device, and leave the termi-
nation enabled on the device.
— Attach the other end connector on the internal
SCSI cable to the SCSI host adapter card, and
disable the termination on the adapter card.
— Attach the external SCSI cable to the external
connector on the SCSI host adapter card, and
leave the termination enabled on the external
device.
CAUTION: Dell does not recommend connect-
ing both internal and external devices to a
single channel on a SCSI host adapter card.
Such a configuration is likely to cause read
and write failures.
General Procedure for Installing SCSI
Devices
Configure and install one or more SCSI devices in your
computer as follows:
1. Determine which connector on the internal SCSI
cable you will attach to each SCSI device.
See "SCSI Configuration Guidelines" found earlier
in this section.
2. Unpack each SCSI device and prepare it for
installation.
Ground yourself by touching an unpainted metal
surface on the back of the computer. Configure the
device for a SCSI ID number, and disable the
termination, if necessary. For instructions, see the
documentation that came with the SCSI device as
well as "SCSI Configuration Guidelines" found
earlier in this section.
Installing Drives 7-11