From owner-freebsd-hackers@FreeBSD.ORG Wed Oct 8 23:28:19 2008 Return-Path: Delivered-To: hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E47F7106568D for ; Wed, 8 Oct 2008 23:28:19 +0000 (UTC) (envelope-from yurtesen@ispro.net) Received: from mail.ispro.net (mail.ispro.net [87.251.0.19]) by mx1.freebsd.org (Postfix) with ESMTP id 688198FC15 for ; Wed, 8 Oct 2008 23:28:18 +0000 (UTC) (envelope-from yurtesen@ispro.net) Received: (qmail 90987 invoked by uid 399); 8 Oct 2008 23:28:35 -0000 Received: from localhost (127.0.0.1) by localhost with ESMTPM; 8 Oct 2008 23:28:35 -0000 X-Originating-IP: 127.0.0.1 Received: from a91-152-230-218.elisa-laajakaista.fi (a91-152-230-218.elisa-laajakaista.fi [91.152.230.218]) by mail.ispro.net (Horde Framework) with HTTP; Thu, 09 Oct 2008 02:28:33 +0300 Message-ID: <20081009022833.73943nda9muz0qo0@mail.ispro.net> Date: Thu, 09 Oct 2008 02:28:33 +0300 From: yurtesen@ispro.net To: "Zaphod Beeblebrox" References: <48E9E1BB.6020908@ispro.net> <48EA56BB.6040702@vwsoft.com> <48EA8B3A.3090609@ispro.net> <861vysiv9i.fsf@ds4.des.no> <5f67a8c40810070937r5ba89773ncee407ace25fa0dd@mail.gmail.com> <86iqs3sdtp.fsf@ds4.des.no> <5f67a8c40810081015p2c14e38evbeed0a97242a7c4a@mail.gmail.com> <48ECF564.7000204@ispro.net> <5f67a8c40810081235k227dc870tce5fcbcbca61d3c1@mail.gmail.com> In-Reply-To: <5f67a8c40810081235k227dc870tce5fcbcbca61d3c1@mail.gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: quoted-printable User-Agent: Internet Messaging Program (IMP) H3 (4.1.6) X-Mailman-Approved-At: Thu, 09 Oct 2008 00:00:01 +0000 Cc: Volker , Dag-Erling =?iso-8859-1?b?U234cmdyYXY=?= , hackers@freebsd.org Subject: Re: continuous backup solution for FreeBSD X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 08 Oct 2008 23:28:20 -0000 Quoting "Zaphod Beeblebrox" : > On Wed, Oct 8, 2008 at 2:01 PM, Evren Yurtesen wrote: > >> Zaphod Beeblebrox wrote: >> >>> >>> Wow... thanks for the flame, but there's no reason that the device that >>> is receiving the hammer replication couldn't be on the other side of the >>> globe and there's no reason it couldn't be considered a backup. =20 >>> Part of the >>> advantage of the structure that allows you to efficiently select for new >>> changes allows you to do the same kind of *backup* as they claim. >>> >>> >> Wouldnt that device need to keep the whole filesystem? Like if you have 1= 0 >> machines with 10x 1GB drives (lets say each used about 250gb), you will n= eed >> 10TB disk space in the backup server? >> > > > Urm... I think everything we've been discussing here backs up the whole > filesystem (it would be near impossible for a block-oriented system to do > elsewise). I suppose you could do something with the archive bit or dump > bits with a filesystem based backup. > > But anyways... in a filesystem based replication system, you'd need enough > space to store the data and the history of the data. The sum of the histo= ry > of the data could even exceed the size of the sum of the input disks. It > could also be much smaller. It really depends on how much you change. > The CDP backup solutions can manage that, even better you dont have to =20 change to a totally new filesystem to use them. I really do not want to have a large argument about this but the only =20 reason we cant do this on FreeBSD is because the companies who write =20 CDP type backup solutions either do not know much about FreeBSD or =20 they just cant find anybody who they can hire to do the job on FreeBSD. So that is why I posted this information to this list. If there is =20 anybody who is capable of porting such software to FreeBSD then they =20 can, 1- probably make money by doing the job, 2- if they have very =20 little free time and not interested in making money then they can =20 perhaps contact some of these companies (for example r1soft seems to =20 be interested in supporting FreeBSD) and give them some hints and =20 ideas on how this can be done on FreeBSD and where to find example =20 codes and more information etc. Thanks, Evren