From owner-freebsd-questions@FreeBSD.ORG Tue Mar 13 19:36:17 2007 Return-Path: X-Original-To: questions@freebsd.org Delivered-To: freebsd-questions@FreeBSD.ORG Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 73F9D16A401 for ; Tue, 13 Mar 2007 19:36:17 +0000 (UTC) (envelope-from pietro.cerutti@gmail.com) Received: from an-out-0708.google.com (an-out-0708.google.com [209.85.132.241]) by mx1.freebsd.org (Postfix) with ESMTP id 216B113C44B for ; Tue, 13 Mar 2007 19:36:16 +0000 (UTC) (envelope-from pietro.cerutti@gmail.com) Received: by an-out-0708.google.com with SMTP id c24so1854590ana for ; Tue, 13 Mar 2007 12:36:16 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=lPspHdYeFfNmZvPEMNhjD/ef6h8O9sglhgOQo8HEI/0qAeF7WiQmSLe9Qxt2R6Cg7r6z8CCVPScvvf5ir8vCGp/kaDrHYx2FLAbIOIpZ7siatygeQ1cr25fe1ixNiaaUm5JAxs2/d832dNKu2Ze72sN6BvytSX/TmmiNvWI1Whk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=EQbZOoKpJAnCxbvhGMQno3OaUsNHcsuz48jAkj7ABGEOH1/EwRDHfeiow7J1Ppj0CqWotAZq0EDLP8m20z/u4k8AjkTNITXNcBnUpv8xzjTfI4AXL40O7AOnGXHFBHat608l6yadImK6D+QgREyzG3Ud7gR/m85s39WibLh6gOg= Received: by 10.100.132.16 with SMTP id f16mr1218242and.1173814576502; Tue, 13 Mar 2007 12:36:16 -0700 (PDT) Received: by 10.100.111.5 with HTTP; Tue, 13 Mar 2007 12:36:16 -0700 (PDT) Message-ID: Date: Tue, 13 Mar 2007 20:36:16 +0100 From: "Pietro Cerutti" To: "Bill Moran" In-Reply-To: <20070313151425.5fc464db.wmoran@potentialtech.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <64784.69.129.174.18.1173797935.squirrel@email.polands.org> <20070313111029.49bd1d14.wmoran@potentialtech.com> <53038.69.129.174.18.1173799128.squirrel@email.polands.org> <20070313143555.ee27a265.wmoran@potentialtech.com> <20070313151425.5fc464db.wmoran@potentialtech.com> Cc: questions@freebsd.org Subject: Re: UFS2 Snapshot limitiations X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Mar 2007 19:36:17 -0000 On 3/13/07, Bill Moran wrote: > In response to "Pietro Cerutti" : > > > On 3/13/07, Bill Moran wrote: > > > In response to "Pietro Cerutti" : > > > > > > > On 3/13/07, Doug Poland wrote: > > > > > > > > > > On Tue, March 13, 2007 10:10, Bill Moran wrote: > > > > > > In response to "Doug Poland" : > > > > > > > > > > > >> Hello, > > > > > >> > > > > > >> I seem to recall, but cannot find, the limitation on the number of > > > > > >> snapshots allowed on UFS2. Could someone point me in the right > > > > > >> direction please? > > > > > > > > > > > > The handbook has it: > > > > > > http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/snapshots.html > > > > > > > > > > > Thank you very much. > > > > > > > > > > > > > Sorry for joining the thread, but it's raised my curiosity: what's the > > > > reason for this limit? > > > > > > I'm not 100% sure, but I believe it's because snapshot information is stored > > > in the filesystem superblock, and that's all that can fit in the space > > > available in the superblock. > > > > This is the same thing that came to my mind, but in the handbook page I found: > > "Active snapshots are recorded in the superblock so they are > > persistent across unmount and remount operations along with system > > reboots." > > > > 1) what an "active" snapshot is? > > I think you're trying too hard to read into this. Active snapshot, as opposed > to a snapshot that has been deleted/unmounted and existed in the past, is what > I took it to mean. Makes sense. Thanks! > > -- > Bill Moran > http://www.potentialtech.com > -- Pietro Cerutti - ASCII Ribbon Campaign - against HTML e-mail and proprietary attachments www.asciiribbon.org