From owner-freebsd-current  Mon Aug  3 14:30:41 1998
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Received: (from majordom@localhost)
          by hub.freebsd.org (8.8.8/8.8.8) id OAA14116
          for freebsd-current-outgoing; Mon, 3 Aug 1998 14:30:41 -0700 (PDT)
          (envelope-from owner-freebsd-current@FreeBSD.ORG)
Received: from uni4nn.gn.iaf.nl (osmium.gn.iaf.nl [193.67.144.12])
          by hub.freebsd.org (8.8.8/8.8.8) with SMTP id OAA14087;
          Mon, 3 Aug 1998 14:30:29 -0700 (PDT)
          (envelope-from wilko@yedi.iaf.nl)
Received: by uni4nn.gn.iaf.nl with UUCP id AA23824
  (5.67b/IDA-1.5); Mon, 3 Aug 1998 22:49:16 +0200
Received: (from wilko@localhost) by yedi.iaf.nl (8.8.8/8.6.12) id WAA02844; Mon, 3 Aug 1998 22:01:27 +0200 (CEST)
From: Wilko Bulte <wilko@yedi.iaf.nl>
Message-Id: <199808032001.WAA02844@yedi.iaf.nl>
Subject: Re: Odd problems with -current...
In-Reply-To: <19980803104548.08864@uriah.heep.sax.de> from J Wunsch at "Aug 3, 98 10:45:48 am"
To: joerg_wunsch@uriah.heep.sax.de
Date: Mon, 3 Aug 1998 22:01:27 +0200 (CEST)
Cc: scrappy@hub.org, scsi@FreeBSD.ORG, current@FreeBSD.ORG
X-Organisation: Private FreeBSD site - Arnhem, The Netherlands
X-Pgp-Info: PGP public key at 'finger wilko@freefall.freebsd.org'
X-Mailer: ELM [version 2.4ME+ PL38 (25)]
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-freebsd-current@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

As J Wunsch wrote...
> As The Hermit Hacker wrote:
> 
> > 	I just put in a 2gig Seagate SCSI drive on my system, to replace a
> > 2gig IDE drive, and after running for awhile, it *seems* that the drive is
> > powering down, cause when I try to access something on that drive after
> > leaving for a period of time, you can hear it power back up again.
> 
> I have been observing this for drives where the SCSI chain had term
> power problems.  ISTR that it's been that more than one device was
> driving term power to the bus, and they apparently had some slightly
> conflicting idea about the actual term power level or such.  So to be
> sure, it's IMHO always the sanest way to just have the host adapter
> driving term power, and have all drives leaving the term power line

Yep. This also has the added advantage that shorting TERMPWR to ground does
not smoke the cables. Each device is normally capable of sourcing > 1 A
of current so it adds up..

Wilko
_     ______________________________________________________________________
 |   / o / /  _  Bulte 				  email: wilko @ yedi.iaf.nl 
 |/|/ / / /( (_) Arnhem, The Netherlands          WWW:   http://www.tcja.nl
______________________________________________ Powered by FreeBSD __________

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message