From owner-freebsd-stable@FreeBSD.ORG Wed Jul 2 15:36:18 2014 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id E5883E21 for ; Wed, 2 Jul 2014 15:36:18 +0000 (UTC) Received: from mail-we0-x22d.google.com (mail-we0-x22d.google.com [IPv6:2a00:1450:400c:c03::22d]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7D0AC22B8 for ; Wed, 2 Jul 2014 15:36:18 +0000 (UTC) Received: by mail-we0-f173.google.com with SMTP id t60so11501687wes.4 for ; Wed, 02 Jul 2014 08:36:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=ph2KJ06VHNHsUOfUsmAAlNh7IEQ7LN9Kt7qyCp41quU=; b=JHAtgSCq5UfpTrCAS/uCOh1adxyKKpzFVUZ11wlq8mkgBdmqL5v795+5oCevJIK+bc 76QIKSQxOVDJWjGphf5xzRUhNsr8QNkyMtL3GoQHroeSPxbeMu9PGopk4HIvTSwzSDgY aAmeoSDwdobkGH2vcxu/RiG7aKqg5IhFpx3ss0Iyb/o/23Btx1HgKsUP20Kx360qUHXe VKzzQTcwcu8Rg2EKqJ4pfS6meUKusFj8eLPt4L3eV6DzC62O/1M1rnX1O2LN4rkwjGZi 8nSL+cKX83pMYACHUE9K2sbpJzc0lt3O9aaEd3+3OM+tTt/+5x2V0gf2NRy7yXWpePFS kbHQ== MIME-Version: 1.0 X-Received: by 10.194.174.35 with SMTP id bp3mr50508258wjc.33.1404315373956; Wed, 02 Jul 2014 08:36:13 -0700 (PDT) Received: by 10.216.186.130 with HTTP; Wed, 2 Jul 2014 08:36:13 -0700 (PDT) In-Reply-To: References: Date: Wed, 2 Jul 2014 11:36:13 -0400 Message-ID: Subject: Re: Dump an Unmounted Journaled UFS Filesystem From: Brandon Allbery To: Warren Block Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.18 Cc: Dan Plassche , freebsd-stable X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 02 Jul 2014 15:36:19 -0000 On Wed, Jul 2, 2014 at 10:14 AM, Warren Block wrote: > On Tue, 1 Jul 2014, Dan Plassche wrote: > > I understand that using dump is not currently recommended on a mounted >> journaled UFS2 filesystem. I prefer to boot from a separate FreeBSD drive >> for cold backups anyway, so I'm wondering if there are any issues with >> running dump on an unmounted journaled filesystem? All the discussions >> I've seen seem to focus on disabling journaling completely, which I would >> like to avoid. >> > > The snapshot code in sys/ufs/ffs/ffs_snapshot.c still prevents making > snapshots on SUJ filesystems. > > What exactly is the point of a snapshot for an *unmounted* ("running dump on an unmounted journaled filesystem", from above quoted text) filesystem? -- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net