From owner-freebsd-hackers Sat Feb 24 22:45:12 2001 Delivered-To: freebsd-hackers@freebsd.org Received: from earth.backplane.com (earth-nat-cw.backplane.com [208.161.114.67]) by hub.freebsd.org (Postfix) with ESMTP id BF71037B491 for ; Sat, 24 Feb 2001 22:45:09 -0800 (PST) (envelope-from dillon@earth.backplane.com) Received: (from dillon@localhost) by earth.backplane.com (8.11.2/8.9.3) id f1P6iuL12016; Sat, 24 Feb 2001 22:44:56 -0800 (PST) (envelope-from dillon) Date: Sat, 24 Feb 2001 22:44:56 -0800 (PST) From: Matt Dillon Message-Id: <200102250644.f1P6iuL12016@earth.backplane.com> To: Bernd Walter Cc: David Gilbert , freebsd-hackers@FreeBSD.ORG Subject: Re: Large MFS on NFS-swap? References: <15000.8884.6165.759008@trooper.velocet.net> <20010225042933.A508@cicely5.cicely.de> Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG :On Sat, Feb 24, 2001 at 04:08:04PM -0500, David Gilbert wrote: :> We have an application which is precompiled, for linux, and stupid. :> It uses (at times large) scratch files. We want to run this on our :> diskless machines (CPU farm) to cut the per-cpu cost of the :> computation ($200/drive starts getting significant at a few hundred :> machines). :> :> Anyways, I've tried: :> :> [1:26:2025]root@spitfire:/usr/u/dgilbert> mount_mfs -T test -s 2097152 -o nosuid,nodev /dev/null /mnt Use the vn device to create a swap-backed filesystem. 'man vnconfig'. (In current VN functionality has been merged into MD and MD in swap-backed mode should be used instead ). If you turn softupdates on on the VN based filesystem, it should work quite nicely for small files and yet still be able to handle the very large files (assuming you have sufficient swap). -Matt To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message