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Date:      Mon, 24 Sep 2001 08:57:30 -0600 (MDT)
From:      Ronald G Minnich <rminnich@lanl.gov>
To:        David Malone <dwmalone@maths.tcd.ie>
Cc:        Attila Nagy <bra@fsn.hu>, <freebsd-hackers@FreeBSD.ORG>
Subject:   Re: Disk based file system cache
Message-ID:  <Pine.LNX.4.33.0109240856270.2435-100000@snaresland.acl.lanl.gov>
In-Reply-To: <20010924152556.A90833@walton.maths.tcd.ie>

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On Mon, 24 Sep 2001, David Malone wrote:

> On Mon, Sep 24, 2001 at 01:07:00PM +0200, Attila Nagy wrote:
> > I'm just curious: is it possible to set up an NFS server and a client
> > where the client has very big (28 GB maximum for FreeBSD?) swap area on
> > multiple disks and caches the NFS exported data on it?
> > This could save a lot of bandwidth on the NFS server and also redues load
> > on that.
>
> This would really be more than NFS is supposed to do. There other
> filesystems which can do this sort of thing - I think Coda might
> be one of them.


see the autocacher paper at http://www.acl.lanl.gov/~rminnich

let me know if this is what you mean. I recently built a new one "from
scratch" and it works.

BUT, at least with Linux, my measurements show that the dcache really
eliminates most of the benefits.

ron



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