Adaptec APA-348 Installationsanleitung PDF herunterladen (Seite 7)

APA-348 Installation Guide

Part Number: 510603-00, Rev. A

Print Spec Number: 492716-00

Current Date: 5/19/94 ECN Date: 5/31/94

many system configurations, implementing a spe-

cial data-transfer mode can result in a 15-20% speed

improvement.

Before trying the techniques described below, make

sure your SCSI hardware and software are properly

installed and configured, and running without prob-

lems. Attempts to improve performance may not

work on your particular installation. Knowing that

the basic installation is working will aid in determin-

ing whether performance enhancements will work

as well. In addition, there is a small chance that data

corruption may occur with incompatible configura-

tions, so make sure that important data on your SCSI

device(s) is backed up before trying this technique.

What is this Technique?

By default, your software is configured to operate in

full handshaking mode, meaning that data transfer via

the MiniSCSI Plus is performed in a manner that

automatically confirms its accuracy. If there are tim-

ing, electrical noise, or other problems that disturb

accurate data flow, the error is automatically

detected and corrected without any user interven-

tion. This mode assures that movement of informa-

tion back and forth is error-free. Full handshaking

requires more interaction by the software, resulting

in somewhat lower performance than if handshaking

were disabled.

You can disable full handshaking and operate your

SCSI installation in blind mode. Many MiniSCSI Plus

configurations operate perfectly and at a much faster

rate in blind mode. The /M software switch allows

you to turn full handshaking mode

OFF to test

whether you can use the faster blind mode.

The /M switch has four possible settings and is set in

your

config.sys

file on the ASPI manager line (see

Additional /M Switch Options on page 9 for more

explanations):

/M0 Standard full handshaking mode (default)

1 Blind mode enabled for higher performance

2 Full handshaking, force unidirectional

3 Blind mode, force unidirectional

1 2 3 4 5 6 7 8 9 10 11 12 13 14

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