On Tue, Aug 4, 2015 at 1:10 AM, Duncan <1i5t5.dun...@cox.net> wrote: > I don't remember you saying anything about trying btrfs restore.
I did try it earlier in dry-run mode and it can't do anything: ========================================= btrfs restore -D /dev/sdc /mnt/saved/ warning, device 2 is missing bytenr mismatch, want=20971520, have=0 Couldn't read chunk root Could not open root, trying backup super warning, device 2 is missing bytenr mismatch, want=20971520, have=0 Couldn't read chunk root Could not open root, trying backup super warning, device 2 is missing bytenr mismatch, want=20971520, have=0 Couldn't read chunk root Could not open root, trying backup super ========================================= Find-roots, list-roots, none of it works. ========================================= btrfs restore --list-roots /dev/sde checksum verify failed on 20971520 found 8B1D9672 wanted 2F8A4238 checksum verify failed on 20971520 found 8B1D9672 wanted 2F8A4238 bytenr mismatch, want=20971520, have=8330001001141004672 Couldn't read chunk root Could not open root, trying backup super warning, device 1 is missing checksum verify failed on 20971520 found 8B1D9672 wanted 2F8A4238 checksum verify failed on 20971520 found 8B1D9672 wanted 2F8A4238 bytenr mismatch, want=20971520, have=8330001001141004672 Couldn't read chunk root Could not open root, trying backup super warning, device 1 is missing checksum verify failed on 20971520 found 8B1D9672 wanted 2F8A4238 checksum verify failed on 20971520 found 8B1D9672 wanted 2F8A4238 bytenr mismatch, want=20971520, have=8330001001141004672 Couldn't read chunk root Could not open root, trying backup super ========================================= btrfs-find-root -a /dev/sdc warning, device 2 is missing Couldn't read chunk root btrfs-find-root -a /dev/sde Couldn't read chunk root Open ctree failed ========================================= In defense of BTRFS it's been absolutely trouble free keeping my data through many power outages, etc. and I plan to keep using it. It was my own doing that caused the problem. Seems that if there was someway to edit something in those first overwritten 32MB of disc 2 to say "hey, I'm really here, just a bit screwed up" maybe some of the recovery tools could actually work. Thanks to all. Chris -- 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
