From owner-freebsd-fs@FreeBSD.ORG Fri Dec 3 20:25:41 2010 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 993681065693 for ; Fri, 3 Dec 2010 20:25:41 +0000 (UTC) (envelope-from admin@obsysa.net) Received: from serwer.obsysa.net (static-78-8-144-74.ssp.dialog.net.pl [78.8.144.74]) by mx1.freebsd.org (Postfix) with ESMTP id 3CA958FC29 for ; Fri, 3 Dec 2010 20:25:41 +0000 (UTC) Received: from [192.168.0.2] by serwer.obsysa.net with esmtpsa (TLSv1:CAMELLIA256-SHA:256) (Exim 4.72 (FreeBSD)) (envelope-from ) id 1PObcx-0009uK-5u; Fri, 03 Dec 2010 20:49:17 +0100 Message-ID: <4CF949B0.5060405@obsysa.net> Date: Fri, 03 Dec 2010 20:49:04 +0100 From: Bartosz Stec User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.2.12) Gecko/20101028 Lanikai/3.1.6 MIME-Version: 1.0 To: =?ISO-8859-1?Q?Peter_Ankerst=E5l?= References: <4CF017C8-9D3C-483D-B508-5BF70E32AA14@pean.org> In-Reply-To: <4CF017C8-9D3C-483D-B508-5BF70E32AA14@pean.org> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Authenticated-User: admin@obsysa.net X-Authenticator: plain X-Sender-Verify: SUCCEEDED (sender exists & accepts mail) X-Spam-Score: -8.1 X-Spam-Score-Int: -80 X-Exim-Version: 4.72 (build at 10-Jun-2010 12:49:35) X-Date: 2010-12-03 20:49:17 X-Connected-IP: 192.168.0.2:54915 X-Message-Linecount: 29 X-Body-Linecount: 16 X-Message-Size: 1090 X-Body-Size: 527 X-Received-Count: 1 X-Recipient-Count: 2 X-Local-Recipient-Count: 2 X-Local-Recipient-Defer-Count: 0 X-Local-Recipient-Fail-Count: 0 X-Mailman-Approved-At: Fri, 03 Dec 2010 20:27:33 +0000 Cc: freebsd-fs@freebsd.org Subject: Re: zfs snapshots. 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: Fri, 03 Dec 2010 20:25:41 -0000 On 2010-12-03 20:40, Peter Ankerstål wrote: > Is there a way to take a snapshot without using space from the parent filesystem? > > -- > Peter Ankerstål > peter@pean.org > http://www.pean.org/ > AFAIK snapshot doesn't take any space as long as filesystem hasn't changed from the time when snapshot was taken. For instance - If you take snapshot on filesystem and after that, 10MB file is deleted, snapshot is using only 10MB space from (because it's only difference between snapshot and actual filesystem). -- Bartosz Stec