From owner-freebsd-hackers  Mon May 28 11:29: 2 2001
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Date: Mon, 28 May 2001 20:34:35 +0200
From: Wilko Bulte <wkb@freebie.demon.nl>
To: "E.B. Dreger" <eddy+public+spam@noc.everquick.net>
Cc: hackers@freebsd.org
Subject: Re: brainstorm: "intermediate" disk caching
Message-ID: <20010528203435.F619@freebie.demon.nl>
References: <Pine.LNX.4.20.0105281619110.5344-100000@www.everquick.net>
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In-Reply-To: <Pine.LNX.4.20.0105281619110.5344-100000@www.everquick.net>; from eddy+public+spam@noc.everquick.net on Mon, May 28, 2001 at 04:31:17PM +0000
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On Mon, May 28, 2001 at 04:31:17PM +0000, E.B. Dreger wrote:
> Greetings all,
> 
> I just had a brainstorm...
> 
> I was thinking about database servers with several spindles in a RAID 5
> array.  Write performance is inherently disappointing -- which may or may
> not be an issue.
> 
> Would it be worth the trouble to design an "intermediate" cache, whereby
> data are quickly written to a spool disk, then to the final destination?

Most hardware RAID boxes do exactly that ;) For anything serious only
consider battery-backed up writeback cache, with mirrored caches, and
redundant RAID array controllers.

Start saving your $$ now ;)

-- 
|   / o / /  _  	 Arnhem, The Netherlands    	email: wilko@freebsd.org
|/|/ / / /( (_) Bulte	 Powered by FreeBSD/alpha 	http://www.freebsd.org 	

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