Date: Thu, 24 Nov 2011 16:15:48 -0800 From: Freddie Cash <fjwcash@gmail.com> To: Johannes Totz <johannes@jo-t.de> Cc: freebsd-fs@freebsd.org Subject: Re: backing up zfs dataset Message-ID: <CAOjFWZ5zonsCxk-QHfvt%2B3qnzWWLkEUS4bfHdy7_%2B4EYFX6ZqA@mail.gmail.com> In-Reply-To: <jammgi$teg$1@dough.gmane.org> References: <j9jiud$oj6$1@dough.gmane.org> <20111124235843.GB96603@johnny.reilly.home> <CAOjFWZ4iOrSDgp2p2pf=62hcUYtBpY=oROSHXZPvCVwZV-f65w@mail.gmail.com> <jammgi$teg$1@dough.gmane.org>
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On Thu, Nov 24, 2011 at 4:12 PM, Johannes Totz <johannes@jo-t.de> wrote: > On 25/11/2011 00:07, Freddie Cash wrote: > >> On Thu, Nov 24, 2011 at 3:58 PM, Andrew Reilly<areilly@bigpond.net.au>** >> 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 <http://parchive.sourceforge.net>; >> > > yeah, was thinking of doing that at some stage. but then send/receive > format is not guaranteed to be stable (has anybody done any tests on this? > try a v1 send with a v28 receive?). > I haven't tried it, but the consensus I've seen on the zfs-discuss mailing list is that so long as the receive side is of a higher (or equal) version to the send side, it's supposed to work. In theory. ;) -- Freddie Cash fjwcash@gmail.com
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