On 28/8/2014 8:04 μμ, Jean-Denis Girard wrote:
Hi Chris,
Thanks for your detailed answer.
Le 28/08/2014 06:25, Chris Murphy a écrit :
9. btrfs-find-root /dev/sdc
Super think's the tree root is at 29917184, chunk root 20987904
Well block 4194304 seems great, but generation doesn't match, have=2, want=9 level 0
Well block 4243456 seems great, but generation doesn't match, have=3, want=9 level 0
Well block 29376512 seems great, but generation doesn't match, have=4, want=9 level 0
Well block 29474816 seems great, but generation doesn't match, have=5, want=9 level 0
Well block 29556736 seems great, but generation doesn't match, have=6, want=9 level 0
Well block 29736960 seems great, but generation doesn't match, have=7, want=9 level 0
Well block 29900800 seems great, but generation doesn't match, have=8, want=9 level 0
Hi all,
I did a successful btrfs restore a few months ago, saving all of my
deleted files except 2 (So i lost about 1GB on a 4TB filesystem)
Here is what i did (this is from memory and from my .zsh_history file,
so i may be missing something)
btrfs-find-root /dev/sdd -o 5 > b1.txt
I think the -o 5 option is quite important here.
After that, i ran this
for i in `awk '{print $3}' b1.txt`; do echo "------------------------
$i --------------------" && btrfs restore /dev/sdd /storage/A3/ -Dv -f
$i ; done
I think i did that in order to brute force a correct offset
I also have done this, in order to find the offset that gave the largest
number of files
for i in `awk '{print $3}' b1.txt`; do echo "------------------------
$i --------------------" && btrfs restore /dev/sdd /storage/A3/ -Dv -f
$i |wc -l ; done
Then i did some test restores using various addresses
btrfs restore /dev/sdd /storage/A3/B1/ -vD -f 2149617336320
btrfs restore /dev/sdd /storage/A3/B1/ -vD -f 1607682736128
btrfs restore /dev/sdd /storage/A3/B1/ -vD -f 2688721551360
and then i finally did the restore using the offset that looked best
btrfs restore /dev/sdd /storage/A3/B1/ -v -f 2688721551360
I hope this helps, good luck!
Here is what the command returns :
[root@x220 ~]# btrfs-find-root /dev/mapper/home
Super think's the tree root is at 115230801920, chunk root 131072
Went past the fs size, exiting[root@x220 ~]#
I just tried with latest btrfs-progs (from git), it returns exactly the
same.
The btrfs partition is on top of dm-crypt, could it be a problem?
Thanks,
Jean-Denis Girard
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Konstantinos Skarlatos
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