From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from racke.linbit (chello080108047253.34.11.vie.surfer.at [80.108.47.253]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.linbit.com (LINBIT Mail Daemon) with ESMTP id 1EFEF2E05437 for ; Tue, 30 Sep 2008 22:02:49 +0200 (CEST) Date: Tue, 30 Sep 2008 22:02:48 +0200 From: Lars Ellenberg To: drbd-dev@lists.linbit.com Subject: Re: [Drbd-dev] New Features: write-back cache mode Message-ID: <20080930200248.GA30030@racke> References: <48D3378E.3020201@gmail.com> <20080919155343.GD9779@soda.linbit> <91a37e890809190919g5a746367g54e76d36e1a825f6@mail.gmail.com> <20080919221339.GB15916@soda.linbit> <48D42783.1050403@gmail.com> <20080920131821.GB16149@racke> <20080920134827.GD16149@racke> <48D5818C.1030703@gmail.com> <20080920231938.GA16320@racke> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080920231938.GA16320@racke> List-Id: Coordination of development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Sun, Sep 21, 2008 at 01:19:38AM +0200, Lars Ellenberg wrote: > On Sat, Sep 20, 2008 at 05:04:44PM -0600, Morey Roof wrote: > > This is pretty much what I was thinking. For the btree, generations, > > and ref-count a good example to look at is how btrfs (This is the other > > project I have started to mess with) works. The design is very > > efficient and I think we could use a very close match for our setup. I > > haven't read the paper you sent yet but will get to that today. > > > > Let me know how you would like to start and I can start working a proof > > of concept and we can see how to go from there. > > I still think that should be implemented as a > generic device-mapper write-back target, > not as part of drbd. > http://www.acis.ufl.edu/~ming/dmcache/ > maybe you can use that as a starting point, > and point it to a ram disk as cache? any news on that? Lars