From owner-freebsd-questions@FreeBSD.ORG Mon Oct 31 16:53:56 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E640E16A41F for ; Mon, 31 Oct 2005 16:53:56 +0000 (GMT) (envelope-from e.schuele@computer.org) Received: from sccrmhc14.comcast.net (sccrmhc14.comcast.net [204.127.202.59]) by mx1.FreeBSD.org (Postfix) with ESMTP id CC75C43D6E for ; Mon, 31 Oct 2005 16:53:50 +0000 (GMT) (envelope-from e.schuele@computer.org) Received: from [208.206.151.59] (host59.gtisd.com[208.206.151.59]) by comcast.net (sccrmhc14) with ESMTP id <20051031163257014001f3m6e>; Mon, 31 Oct 2005 16:33:08 +0000 Message-ID: <43664702.9040209@computer.org> Date: Mon, 31 Oct 2005 10:32:02 -0600 From: Eric Schuele User-Agent: Mozilla Thunderbird 1.0.7 (X11/20050930) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Csaba Henk References: <20051030134902.GG2911@beastie.creo.hu> <72cf361e0510300958w33bf3u3f754e68794b858d@mail.gmail.com> <43651D7B.6000005@computer.org> <20051031140038.GH2911@beastie.creo.hu> <43663AE0.2040606@computer.org> <20051031160902.GI2911@beastie.creo.hu> In-Reply-To: <20051031160902.GI2911@beastie.creo.hu> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-questions@freebsd.org Subject: Re: backup strategies 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: Mon, 31 Oct 2005 16:53:57 -0000 Csaba Henk wrote: > On Mon, Oct 31, 2005 at 09:40:16AM -0600, Eric Schuele wrote: > >>How do snapshots work and how do they provide the consistency necessary >>for a dump? > > [...] > >>SoftUpdates are required on the filesystem. > > > This sounds beautiful. I am amazed. I knew of softupdates, but they were > always a shady corner of my understanding of BSD. > > So live fs dumping is based on the great hackery of softupdates. Fine, > but in this case... shouldn't the man page make a mention of it? The online manual mentions it in 16.13. Wouldn't hurt for it to be in the man page as well. > > It just says that -L is ignored in case of unmounted/ro mounted fs-s, > or if there is no proper .snap dir. But it doesn't say that it will be > ignored if softupdates is not turned on... > > Going a bit off: which OS-es provide this live snapshot dumping > capability? FreeBSD? FreeBSD >= 5.x ? *BSD ? Maybe something else? AFAIK FreeBSD 5.0+. Other *BSD as well, i believe... but someone else would have to answer that. > (AFAIK, softupdates is supported also in other members of the BSD > family, yet the NetBSD dump manpage didn't have such a -L flag...) > -- Regards, Eric