From owner-freebsd-questions@FreeBSD.ORG Sat May 26 22:00:28 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 4859816A400 for ; Sat, 26 May 2007 22:00:28 +0000 (UTC) (envelope-from svein.h@lvor.halvorsen.cc) Received: from signal.itea.ntnu.no (signal.itea.ntnu.no [129.241.190.231]) by mx1.freebsd.org (Postfix) with ESMTP id 01A9013C448 for ; Sat, 26 May 2007 22:00:27 +0000 (UTC) (envelope-from svein.h@lvor.halvorsen.cc) Received: from localhost (localhost [127.0.0.1]) by signal.itea.ntnu.no (Postfix) with ESMTP id D720B3387A for ; Sun, 27 May 2007 00:00:26 +0200 (CEST) Received: from maren.thelosingend.net (maren.math.ntnu.no [129.241.211.48]) by signal.itea.ntnu.no (Postfix) with SMTP for ; Sun, 27 May 2007 00:00:26 +0200 (CEST) Received: (qmail 94779 invoked by uid 88); 27 May 2007 00:00:26 +0200 Received: from maren.math.ntnu.no (HELO weld.ej2.thelosingend.net) (129.241.211.48) by maren.thelosingend.net (qpsmtpd/0.31.1) with ESMTP; Sun, 27 May 2007 00:00:11 +0200 Message-ID: <4658ADB1.3050807@lvor.halvorsen.cc> Date: Sat, 26 May 2007 23:59:13 +0200 From: Svein Halvor Halvorsen User-Agent: Thunderbird 2.0.0.0 (X11/20070523) MIME-Version: 1.0 To: Roland Smith References: <465864F4.7060500@lvor.halvorsen.cc> <20070526180336.GB34660@slackbox.xs4all.nl> <465884E3.5000500@lvor.halvorsen.cc> <20070526194342.GA37130@slackbox.xs4all.nl> <465898D5.7080607@lvor.halvorsen.cc> <20070526211201.GA40139@slackbox.xs4all.nl> In-Reply-To: <20070526211201.GA40139@slackbox.xs4all.nl> X-Enigmail-Version: 0.95.0 OpenPGP: id=9198BB40; url=mailto:pgpkey@svein.halvorsen.cc Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Checked: Checked X-Content-Scanned: with sophos and spamassassin at mailgw.ntnu.no. Cc: questions@freebsd.org Subject: Re: Restore UFS snapshot 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: Sat, 26 May 2007 22:00:28 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Roland Smith wrote: > You could use rsync instead of tar. That would save time. I'm not talking about saving time. But saving CPU time and HDD stress. However, the disk space issue is a bigger one: >> (b) Undo all the bit flipping I have done, since I made the snapshot. > > This is what the procedure above does if you replace the tar commands > with rsync. No, because the snapshot will still be in use, and hence all its bits will be kept intact and read-only. When I use rsync/tar/cpio or whatever to "undo" changes to a file system, I will in reality copy these bits to different places on the disk. And until I release the snapshot (which I very well could, since it would defunct after the restore process), I will use twice the amount of disk space. Svein Halvor -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) Comment: mailto:pgpkey@svein.halvorsen.cc to get my PGP-key iD8DBQFGWK2vhQg3vZGYu0ARAk/5AJ9QksQAbmwKTJLkwKGhISMpMvOEZgCgwG5u s7bYTdMu9DEIylAhTCeepzI= =5cD3 -----END PGP SIGNATURE-----