On Sun, Jun 05, 2016 at 06:03:53PM +0200, Arne Jansen wrote: > On 05/06/16 17:32, Pawel Jakub Dawidek wrote: > > Unfortunately tools like photorec won't work (I assume the tool scans > > the disk and looks for some JPEG headers, etc.) as this was RAIDZ1 pool, > > so none of the disks contains recognizable data. > > Are you sure? Isn't only the parity information unusable? So 2/3 of the > information should be there in plain. It would be good to revive > the broken disk, though.
Each ZFS block will be broken into two pieces. By default maximum block size if 128kB, so on disk 0 you will find first, third, etc. 64kB chunk of the photo. Enough to find a JPEG header, indeed, by photos are rather larger. > > Two questions come to my mind: > > 1. Is it possible to recover the data now? > > 2. Is it possible to recover the data in theory? > > > > I'm afraid the answer to the first question is 'no', because we are not > > aware of any existing tools that could help you with the process and to > > do it now you would need to find ZFS expert willing to spend some > > serious amount of time, which I'm sure will cost a lot. > > > > But if I understand your description correctly, the data is still on the > > disks, so in theory it should be possible to recover it. Maybe not now, > > but in 5 years? 10 years? Family memories is probably not something you > > need immediately and after some time someone may develop a tool to help > > recover data from the pools like yours. Even if noone will, maybe you > > will become rich enough (or maybe you are already, no idea) to sponsor > > development of such a tool. > > Writing such a tool would be fun, but it would probably take weeks to > months to write it. The question is if there are enough broken pools to > make it worth investing the time. When I decided to port ZFS to FreeBSD my estimation was to have a working rad-write prototype in 6 months. It took 10 days (and nights). You won't be able to tell until you try:) -- Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://mobter.com
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