Date: Sat, 12 Nov 2011 15:12:43 +0000 From: Johannes Totz <jtotz@imperial.ac.uk> To: freebsd-fs@freebsd.org Subject: Re: backing up zfs dataset Message-ID: <j9m2db$9au$1@dough.gmane.org> In-Reply-To: <CAGMYy3tXgrmnLtxE-kavAVMBFc%2Btsu5nQ1iJznT6res8o2_6vg@mail.gmail.com> References: <j9jiud$oj6$1@dough.gmane.org> <CAGMYy3tXgrmnLtxE-kavAVMBFc%2Btsu5nQ1iJznT6res8o2_6vg@mail.gmail.com>
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On 11/11/2011 20:40, Xin LI wrote: > On Fri, Nov 11, 2011 at 8:36 AM, Johannes Totz<jtotz@imperial.ac.uk> wrote: >> Hi, >> >> To back up a zfs dataset there are a few possibilities: >> 1) rsync file data to another machine >> 2) zfs-send to another machine, into a zfs dataset >> 3) zfs-send to another machine, dumping the stream to a file >> >> The first one works alright but you loose admin info, properties set on the >> dataset, etc >> The second is prefered but requires another machine which runs zfs. >> The third is bad. >> >> So far I have been doing (3), for daily short-term backups, works, tested, >> everything is peachy. However, I dont like it anymore for obvious reasons. >> Ideally, I would like to go with (2). But I dont have another zfs-capable >> machine, or the machine that I would like to backup onto will not ever run >> zfs. >> >> So I came up with another crazy idea, assuming the remote machine exports a >> block device (somehow): >> 4) zpool-attach the remote block dev as a mirror, let it resilver, offline >> it during the day, at night online it, resilver, and so on >> 5) create a pool on the block dev locally on the to-be-backed-up-machine and >> periodically zfs-send stuff over >> >> I would go for (4), it seems to be the mostly automatic. >> Any thoughts on this? >> Should I expect things to go titsup if there's network issues? > > I think this is not a good idea. Could you please try if zstreamdump > would fulfill your need? How do you mean? I didn't have a chance to test it yet but from looking at examples online, it dumps the stream-headers. Should I be trying this in combination with rsync to preserve properties? I could just pipe zfs get all to a file. However, restore should be as automatic as possible. This is where (4) would be quite nice: I could just dd the remote block dev into a new HDD.
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