Adaptec 3940UW User's Guide download pdf (Page 69)

AHA-3940U/3940UW/3940UWD User’s Guide

Stock Number: 511041-00, Rev. B Page: A-1

Print Spec Number: 494569-00

Current Date: 2/14/97 ECN Date: 2/17/97

A-1

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Multiple Computer

Configuration

Normally your AHA-3940U/3940UW/3940UWD SCSI bus configu-

ration includes one host adapter installed in one computer, with one

or more internal and/or external SCSI devices attached to each

channel on the host adapter. However, two computers can share

SCSI devices without changing the cable configuration every time

one of the computers needs access to the devices.

To allow computers to share SCSI devices, install a jumper shunt on

the J3 (for Channel B) or J6 (for Channel A) termination jumper of

your AHA-3940U/3940UW/3940UWD host adapter. Then connect

the AHA-3940U/3940UW/3940UWD channel, the SCSI peripherals,

and the host adapter in the second computer. Figure A-1 shows this

arrangement.

Caution:

Boot up only one computer at a time, so that initial

negotiations with the devices are not interrupted.

The host adapter in each computer acts as a terminator at its end of

the SCSI bus. There are certain restrictions to this arrangement, as

explained below.

Restrictions and Requirements

■

You must install a jumper shunt on the J3 (for Channel B) or J6

(for Channel A) termination jumper of the host adapter during

installation.

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Adaptec 3940UW User's Guide Page 69