From owner-freebsd-fs@FreeBSD.ORG Fri Nov 25 00:07:12 2011 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 4BB19106566B for ; Fri, 25 Nov 2011 00:07:12 +0000 (UTC) (envelope-from fjwcash@gmail.com) Received: from mail-vw0-f54.google.com (mail-vw0-f54.google.com [209.85.212.54]) by mx1.freebsd.org (Postfix) with ESMTP id 01BC58FC12 for ; Fri, 25 Nov 2011 00:07:11 +0000 (UTC) Received: by vbbfa15 with SMTP id fa15so3999950vbb.13 for ; Thu, 24 Nov 2011 16:07:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=BAFDvBUSPtXvEL/KBByej6uY+RtlPpEkhydemmR9YV0=; b=tpBP6MDMiSzFiHMzXDT1qqBB2qyARU6n/UtQPliibiPjWmyNtRf0Xulvhw82vBVXna F/koabnDaCt1FWU+qx3o9+L+Fh0ocBc0LKE4g4SYyIsoZ1HVK8SgfT6rPJus3oc+AScm ZVYyUm0SxxULwyC77XYvOdfBPhj4gi2ZaKojo= MIME-Version: 1.0 Received: by 10.52.27.131 with SMTP id t3mr31902577vdg.29.1322179630846; Thu, 24 Nov 2011 16:07:10 -0800 (PST) Received: by 10.220.190.71 with HTTP; Thu, 24 Nov 2011 16:07:10 -0800 (PST) In-Reply-To: <20111124235843.GB96603@johnny.reilly.home> References: <20111124235843.GB96603@johnny.reilly.home> Date: Thu, 24 Nov 2011 16:07:10 -0800 Message-ID: From: Freddie Cash To: Andrew Reilly Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-fs@freebsd.org, Johannes Totz Subject: Re: backing up zfs dataset 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, 25 Nov 2011 00:07:12 -0000 On Thu, Nov 24, 2011 at 3:58 PM, Andrew Reilly wrote: > I do think that backup is something of a weakness for ZFS at > the moment. Sure, live filesystems and snapshots are clearly > cool, and the modern way and all, but there is an awful lot of > flexibility and ease of undersanding in the model of a "backup > file on a tape." Doesn't have to be on a tape, but the moral > equivalent to dump/restore would (in my book) be a wonderful > addition to ZFS, if anyone felt inclined. Just padding the > send/receive serialisation format with enough checksum and > restart information to allow detection and graceful recovery > from read errors in the backup medium would do the job. One could probably work around this by doing a zfs send to a file, then running it through parchive [1] to generate all the redundancy data. Granted, I've never used par, so it may or may not be feasible. [1] http://parchive.sourceforge.net -- Freddie Cash fjwcash@gmail.com