Connecting External Options
Connecting External Options
The information in this section supplements the instructions that come with the
external options (SCSI drives, printers, modems, and other serial and parallel
devices). To connect external options, see the documentation that comes with the
options.
Adding External SCSI Devices
Your server comes with a 16-bit UltraSCSI controller on the system board, which
provides two independent SCSI channels. This controller has two 68-pin, shielded,
high-density connectors: one internal, on the controller, and one external, on the
back of the server. You can use these connectors to install an additional internal
SCSI device in your server or to attach up to fifteen external SCSI devices to your
server.
The internal SCSI connector provides support for SCSI devices installed inside the
server. The external SCSI connector provides support for external SCSI devices.
Notes:
1. If you plan to install both internal and external SCSI devices, you must follow
the instructions given in “Installing or Removing Internal Drives” on page 56 in
addition to the instructions in this section. Read “Installing or Removing
Internal Drives,” and then return here.
For additional information about SCSI configurations supported, see
http://www.pc.ibm.com/netfinity/
2. Do not exceed the following cable lengths:
If you connect one or more Fast SCSI devices to the SCSI controller, the
total length of all cables (internal and external) must not exceed 3 meters
(9.8 feet).
If you do not connect Fast SCSI devices to the SCSI controller, the total
length of all cables must not exceed 6 meters (19.7 feet).
You must set a unique SCSI ID for each external SCSI device so that the controller
can identify the devices. The controller can then ensure that different devices do
not attempt to transfer data at the same time. Therefore, do not set the SCSI IDs
for external devices to the values you used for the controller.
If you plan to attach an external SCSI device, you might need to order an additional
SCSI cable. To use an external device with the Netfinity 5000 server, you must
connect it to the external SCSI connector, using a SCSI cable. This SCSI cable
must have the proper connector for the SCSI external connector on one end, and
the proper connector for the external device on the other end. If a SCSI cable
does not come with the external device, or if it is the wrong type, you will need to
order one. To select and order the correct SCSI cable for use with the external
device, contact your IBM reseller or IBM marketing representative.
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Netfinity 5000 Server Hardware Information and Procedures
