Newsgroups: comp.periphs.scsi
Path: lth.se!sunic!mcsun!uunet!sybus.sybus.com!myrddin!pdn!tct!jim
From: jim@tct.com (Jim Kunzman)
Subject: Powering SCSI devices
Message-ID: <2A98ED54.64FC@tct.com>
Date: Mon, 24 Aug 1992 14:08:20 GMT
Organization: TC Telemanagement, Clearwater, FL
Lines: 24

A while ago I posted an article about removing devices from a live
SCSI bus.  The general concensus was that this is not a good idea and
I concur completely, since random noise might cause a corrupt write to
a disk drive.

Over the weekend I read an article in Byte about the "greening" of
computers, an article about the environmental concerns that
microcomputers have surfaced.  One topic was power consumption.  I
immediately thought about the problems we have with SCSI devices and
wondered if it would be possible to shutdown SCSI devices when they
aren't being used, e.g. scanners, printers, tape backup units, MO
drives, etc.

Since the SCSI controller is connected directly to the powered device,
I would suspect that turning these devices off might cause the same
problem as removing the device from the bus.  Is this correct?  I
would appreciate receiving empirical evidence about this.  I would
also be interested in knowing if the SCSI specs address this issue.


-- 
Jim Kunzman at Teltronics/TCT     <jim@tct.uucp>, <uunet!pdn!tct!jim>
-----
OS/2 is dead!  Long live OS/2!
