Re: Unable to mount degraded RAID5

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On Mon, Jul 11, 2016 at 11:17 AM, Tomáš Hrdina <thomas.rkh@xxxxxxxxx> wrote:
> sudo btrfs-debug-tree /dev/sdc
> It has 200000 lines. Don't know, what you use for bigger files.
>
>
> sudo btrfs-debug-tree -b 6062434418688 /dev/sdc
> http://sebsauvage.net/paste/?fc156dee1d1deb3b#YpG/TA0H3I313jMuC4pgsdj++TcuDaFwWIBeuuOXfCA=
>
> sudo btrfs-debug-tree -b 6062497202176 /dev/sdc
> http://sebsauvage.net/paste/?86621abec9c239bd#kwTpZ7BZLcLw71yCfr3jHKZT08zsaXK3RgdFo7MFoFc=
>
>
> sudo btrfs-debug-tree -b 6062470332416 /dev/sdc
> http://sebsauvage.net/paste/?4ff40fa0b6b201c9#nFk7pT9MLj2w9egUJlgXdkmCkWyp1vSG0kADfq3J7eA=

None of these have anything useful in them, there's no tree root there.


>
> It got some results, but I don't know, what to look for.
>
>
> sudo btrfs-map-logical -l 7008899547136 /dev/sdc
> parent transid verify failed on 7008807157760 wanted 70175 found 70133
> parent transid verify failed on 7008807157760 wanted 70175 found 70133
> checksum verify failed on 7008807157760 found F192848C wanted 1571393A
> checksum verify failed on 7008807157760 found F192848C wanted 1571393A
> bytenr mismatch, want=7008807157760, have=65536
> mirror 1 logical 7008899547136 physical 735226609664 device /dev/sdb
> mirror 2 logical 7008899547136 physical 3166748524544 device /dev/sdc
>
>
> Also I don't know, what to do with this. How to compute new csum.

Right, that's pretty tricky to do manually.



>
> For me, it would be ok to give up and just start fresh.

OK in that case do that.


-- 
Chris Murphy
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