From owner-freebsd-fs@FreeBSD.ORG Tue Feb 13 20:20:45 2007 Return-Path: X-Original-To: freebsd-fs@freebsd.org Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id E144A16A46B for ; Tue, 13 Feb 2007 20:20:45 +0000 (UTC) (envelope-from julian@elischer.org) Received: from outD.internet-mail-service.net (outD.internet-mail-service.net [216.240.47.227]) by mx1.freebsd.org (Postfix) with ESMTP id C9B7A13C4AA for ; Tue, 13 Feb 2007 20:20:45 +0000 (UTC) (envelope-from julian@elischer.org) Received: from mx0.idiom.com (HELO idiom.com) (216.240.32.160) by out.internet-mail-service.net (qpsmtpd/0.32) with ESMTP; Tue, 13 Feb 2007 11:57:25 -0800 Received: from [192.168.2.5] (home.elischer.org [216.240.48.38]) by idiom.com (Postfix) with ESMTP id 555AC125B31; Tue, 13 Feb 2007 12:19:53 -0800 (PST) Message-ID: <45D21D68.5030503@elischer.org> Date: Tue, 13 Feb 2007 12:19:52 -0800 From: Julian Elischer User-Agent: Thunderbird 1.5.0.9 (Macintosh/20061207) MIME-Version: 1.0 To: Eric Anderson References: <45CD6FF5.8070007@freebsd.org> <20070213075627.63126.qmail@web34502.mail.mud.yahoo.com> <6FC9F9894A9F8C49A722CF9F2132FC2204C9DAB4@ms05.mailstreet2003.net> <6FC9F9894A9F8C49A722CF9F2132FC2204C9DAB5@ms05.mailstreet2003.net> <6FC9F9894A9F8C49A722CF9F2132FC2204C9DAB6@ms05.mailstreet2003.net> <45D1F30A.6080403@freebsd.org> <45D20037.1040102@freebsd.org> <45D20DA0.4050600@elischer.org> <45D21A82.7000900@freebsd.org> In-Reply-To: <45D21A82.7000900@freebsd.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-fs@freebsd.org, Ivan Voras Subject: Re: UFS2 with SAN X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Feb 2007 20:20:46 -0000 Eric Anderson wrote: > On 02/13/07 13:12, Julian Elischer wrote: >> Eric Anderson wrote: >>> On 02/13/07 12:09, Ivan Voras wrote: >>>> Eric Anderson wrote: >>>> >>>>> You might look at tdfs (fuse module from Ivan Voras I believe). It's >>>>> probably horribly beta (not knocking it Ivan - I'm sure it's an >>>>> amazing >>>>> start), so lots of testing would need to be done. It's also most >>>>> likely >>>>> not high performance. >>>> Yes, I'm realistic about it - it is "horribly beta" :) >>>> >>>> Two reasons: one: I couldn't amass enough interested parties to help >>>> test it (and possibly work on it), and second: while it's a nice >>>> problem >>>> to tackle, I don't [yet] need it that badly to start working on it >>>> outside of free time). In any case, TDFS doesn't have locking because >>>> FUSE doesn't have it (or didn't when I started doing it), so it stays >>>> single-writer-multiple-readers until that changes. >>>> >>>> I'm thinking of re-creating it in kernel mode (and in this form it >>>> could >>>> also have locking) but not any time soon. Maybe during the summer (SoC? >>>> probably.). >>>> >>> >>> I've thought about this too - and even thought about making it a file >>> system layer, like nullfs, with a network-kernel piece to notify the >>> readers of changes, etc. I'm not certain if it would work or not.. >> >> it will be very interesting to see the outcome from Matt's cluster >> filesystem on Dragonfly. > > > Is it actually being developed? Last I checked, there was talk, but no > code.. :( He's doing all the underlying stuff. for example he has done a lot in the VFS layer to get ready for it.. (e.g. cache coherency support). > > > Eric