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Date:   Tue, 5 Apr 2022 11:11:08 -0700
From:   Marc MERLIN <marc@merlins.org>
To:     Josef Bacik <josef@toxicpanda.com>
Cc:     "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: Rebuilding 24TB Raid5 array (was btrfs corruption: parent
 transid verify failed + open_ctree failed)
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On Tue, Apr 05, 2022 at 01:41:10PM -0400, Josef Bacik wrote:
> Ok I think I'm going to do a humpty-dumpty thing where I scan for the
> best possible copies of blocks and stitch them into the tree root.
> I've wired something up to find out how many bad slots we're working
> with so I've got an idea of how careful I need to be, can you pull
> your branch again, rebuild, and run
> 
> ./btrfs-find-root -o 1 /dev/whatever
> 
> and send me the output?  I'm working on the tool right now, hoping it
> takes me a couple of hours at most (mostly because I have meetings
> sporadically throughout today).  Thanks,

Cool. there you go

gargamel:/var/local/src/btrfs-progs-josefbacik# ./btrfs-find-root -o 1
/dev/mapper/dshelf1a
Couldn't read chunk tree
WTF???
ERROR: open ctree failed

Marc
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Home page: http://marc.merlins.org/