From owner-freebsd-scsi Thu Jul 18 15:15:46 1996 Return-Path: owner-freebsd-scsi Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id PAA23155 for freebsd-scsi-outgoing; Thu, 18 Jul 1996 15:15:46 -0700 (PDT) Received: from linux4nn.gn.iaf.nl (root@linux4nn.gn.iaf.nl [193.67.144.34]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id PAA23146 for ; Thu, 18 Jul 1996 15:15:42 -0700 (PDT) Received: from uni4nn.iaf.nl (root@uni4nn.iaf.nl [193.67.144.33]) by linux4nn.gn.iaf.nl (8.6.9/8.6.9) with SMTP id AAA12503; Fri, 19 Jul 1996 00:17:01 +0200 Received: by uni4nn.iaf.nl with UUCP id AA09303 (5.67b/IDA-1.5); Fri, 19 Jul 1996 00:16:31 +0200 Received: by iafnl.es.iaf.nl with UUCP id AA22786 (5.67b/IDA-1.5); Thu, 18 Jul 1996 23:36:25 +0200 Received: (from wilko@localhost) by yedi.iaf.nl (8.6.12/8.6.6) id XAA02887; Thu, 18 Jul 1996 23:04:03 +0200 From: Wilko Bulte Message-Id: <199607182104.XAA02887@yedi.iaf.nl> X-Organisation: Private FreeBSD site - Arnhem - The Netherlands Subject: Re: turning off scsi disks To: y0002257@ws.rz.tu-bs.de (Sven Brandenburg) Date: Thu, 18 Jul 1996 23:04:02 +0200 (MET DST) Cc: freebsd-scsi@freebsd.org In-Reply-To: <9607181717.AA79038@rzrtr1.rz.tu-bs.de> from "Sven Brandenburg" at Jul 18, 96 07:17:48 pm X-Mailer: ELM [version 2.4 PL23] Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-scsi@freebsd.org X-Loop: FreeBSD.org Precedence: bulk As Sven Brandenburg wrote... > I hope this isn't FAQ or already in progress - > but I wonder whether it is possible to turn off a scsi harddisk > automatically after a certain time of no operation - recent ide drives can > handle this. > > I know, *SOME* older scsi drives knew a vendor specific command which performed > the same - but I tried this with my (newer) harddisks and it didn4t work :-( > > My question is: > Can someone help me to find out the *RIGHT* scsi commands for my disks > or START/STOP unit should do it. > I suppose turning off a scsi harddisk with the scsi(8) command and START/STOPUNIT > crashes the whole system rather than reducing noise ;-) You better be a bit careful with this. The very nice MTBF figures we see these days are definitely not spec'ed by a system turning the drive on/off every couple of minutes. At least not if the drive was not designed for this. E.g. laptop drives even have 'parking ramps' to lay their heads to rest ;-) Wilko _ ____________________________________________________________________ | / o / / _ Wilko Bulte email: wilko@yedi.iaf.nl |/|/ / / /( (_) Private FreeBSD site - Arnhem - The Netherlands --------------------------------------------------------------------------