From owner-freebsd-scsi  Sun Oct 18 03:59:59 1998
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From: Wilko Bulte <wilko@yedi.iaf.nl>
Message-Id: <199810172131.XAA08150@yedi.iaf.nl>
Subject: Re: filesystem safety and SCSI disk write caching
In-Reply-To: <19981017191758.A13174@gvr.org> from Guido van Rooij at "Oct 17, 98 07:17:58 pm"
To: guido@gvr.org (Guido van Rooij)
Date: Sat, 17 Oct 1998 23:31:18 +0200 (CEST)
Cc: tlambert@primenet.com, dkelly@hiwaay.net, freebsd-fs@FreeBSD.ORG,
        freebsd-scsi@FreeBSD.ORG
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As Guido van Rooij wrote...
> On Fri, Oct 16, 1998 at 07:58:17PM +0000, Terry Lambert wrote:
> > 
> > The errors seen are a result of uncommitted data in the drive cache,
> > not power spikes and gremlins.  The interaction is well understood,
> > and on firm footing unrelated to Stephan King novels.
> 
> I always thought a drive will always be able to flush its write cache
> to disk, even when power fails. 

You'd say so, but it is not always the case. I have discussed with the
disk experts in our company and they have told me enough to always keep
WB caching disabled.

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