IBM 5000 manual Connecting External Options, Adding External SCSI Devices

Connecting External Options

Connecting External Options

The information in this section supplements the instructions that come wit external options (SCSI drives, printers, modems, and other serial and pa devices). To connect external options, see the documentation that comes options.

Adding External SCSI Devices

Your server comes with a 16-bit UltraSCSI controller on the system boar provides two independent SCSI channels. This controller has two 68-pin, shie high-density connectors: one internal, on the controller, and one external, back of the server. You can use these connectors to install an additi SCSI device in your server or to attach up to fifteen external SCSI server.

The internal	SCSI connector provides support for SCSI devices installed in
server. The	external	SCSI	connector provides	support for external SCSI	de
Notes:
1. If you	plan to	install both internal and		external SCSI devices,	you
the instructions given in “Installing or Removing Internal Drives” on					pa
addition	to the instructions in this section. Read “Installing or Remo
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:

Ÿ If	you connect	one	or more Fast SCSI devices to	the	SCSI	control
total	length of	all	cables (internal and external)	must	not	exceed
(9.8	feet).

ŸIf you do not connect Fast SCSI devices to the SCSI controller,

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

can

identify

the

devices. The

controller

can then

ensure

that

differe

not

attempt

to

transfer

data

at the same time. Therefore, do not set

for

external

devices

to

the

values

you

used

for

the

controller.

If

you

plan

to

attach

an

external

SCSI

device,

you might need to ord

SCSI

cable. To

use an

external

device

with

the

Netfinity

5000

server,

y

connect it

to

the external SCSI connector, using a

SCSI

cable. This

SCSI

must

have

the

proper

connector

for the SCSI external connector on one

the proper connector for the

external

device

on

the

other

end. If

a

does

not

come

with the external device, or if

it is the wrong type,

order

one. To

select and order the correct SCSI cable for use with

device,

contact

your

IBM

reseller

or

IBM

marketing

representative.

72 Netfinity 5000 Server Hardware Information and Procedures