On Mon, Sep 7, 2015 at 11:58 AM, Chris Murphy <li...@colorremedies.com> wrote: > On Sat, Sep 5, 2015 at 4:42 AM, Hugo Mills <h...@carfax.org.uk> wrote: >> On Sat, Sep 05, 2015 at 12:13:30PM +0200, Ivan Petrovic wrote: > >>> So you're saying that I can't make first and third partition to work >>> with it's data? Maybe I'll try with btrfs-restore, do you think it can >>> rescue this 2 drives? >> >> Unlikely. Like I said, if the FS was using single storage for >> everything, a random 33% of the filesystem has gone away. There's >> probably not enough of it left to make anything coherent. > > With single profile for everything, is metadata and data guaranteed to > be co-located on the same device? If not, then there's no way for this > to be recovered. If they are, then I think recovery would depend on > the system chunk always being device-n mirrored, which we don't have.
Sorry. In single device failure, raid1 system chunk is possible and might help. But to be able to recover data from any surviving drive (n-1 failures) would mean each device has a copy of the system chunk, in addition to guaranteed co-location of data and metadata chunks. -- Chris Murphy -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
