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Message-ID: <00e001c175fa$90d02b40$6caaa8c0@kevin>
From: "Kevin P. Fleming" <kevin@labsysgrp.com>
To: "Chris Wedgwood" <cw@f00f.org>, "Mark Hahn" <hahn@physics.mcmaster.ca>
Cc: <linux-kernel@vger.kernel.org>
In-Reply-To: <3BFFE8A2.1010708@rueb.com> <Pine.LNX.4.10.10111241402420.3696-100000@coffee.psychology.mcmaster.ca> <20011125222313.D9672@weta.f00f.org>
Subject: Re: Disk hardware caching, performance, and journalling
Date: Sun, 25 Nov 2001 14:45:57 -0700
Organization: LSG, Inc.
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I think if you have a large mail server and zero power protection, you've
got much larger problems to worry about than write-behind caching on your
disk drives... my servers have never (in my memory) experienced a
catastrophic power failure, because they're too easy to avoid.

----- Original Message -----
From: "Chris Wedgwood" <cw@f00f.org>
To: "Mark Hahn" <hahn@physics.mcmaster.ca>
Cc: <linux-kernel@vger.kernel.org>
Sent: Sunday, November 25, 2001 2:23 AM
Subject: Re: Disk hardware caching, performance, and journalling


> On Sat, Nov 24, 2001 at 02:39:44PM -0500, Mark Hahn wrote:
>
>     why does everyone get freaked out about disk caches?  afaikt,
>     there's only an O(50ms) window at each catastrophic power failure:
>     trivial for any reasonable rate of failures...
>
> If your disks are busy all the time (eg. a large mail server) then you
> will trivially hit this and it will be a problem.
>
>
>
>   --cw
> -
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