Adaptec 3940UW User's Guide download pdf (Page 73)

B-3

Optimizing Performance

AHA-3940U/3940UW/3940UWD User’s Guide

Stock Number: 511041-00, Rev. B Page: B-3

Print Spec Number: 494569-00

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

Enabling Send Start Unit Command

This option, which is supported by some SCSI devices, reduces the

load on your computer's power supply by allowing the channel to

turn on disk devices and other peripherals one-at-a-time when the

computer boots. Otherwise, all peripherals turn

at the same time.

Send Start Unit Command is Disabled (set to no) by default. Check

your hardware documentation before you enable (set to yes) this

option, to make sure your devices support it. Then change the

switch or jumper settings on the device to enable the option. See

Send Start Unit Command on page 3-14 for more information about

this option.

Try enabling Send Start Unit Command for one peripheral at a time,

rebooting each time to make sure each SCSI device works properly.

(Some older disk devices do not support this option and may mal-

function if they receive the command.)

The Send Start Unit Command has no effect if the channel BIOS is

disabled.

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Adaptec 3940UW User's Guide Page 73