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Date:   Tue, 5 Apr 2022 17:35:21 -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 08:23:42PM -0400, Josef Bacik wrote:
> Alright it's time for the crazy.  Go ahead and pull and start running.
> This is going to take a while to run, we're basically going to walk
> and check all the node pointers in the tree root, if it doesn't look
> right we're going to search the metadata for the best copy to use, and
> then update the block to point at the new block.  It has to do the
> full search every time, because we don't have time for me to properly
> implement a cache, so don't be worried if it takes a while.
> 
> It may print out stuff, if it looks like it's looping stop it and let
> me know, but I don't think I fucked it up.  You're going to see a lot
> "fixed root <id>", "fixed slot <whatever>", if you see it repeating
> the same slot or root then we know we have a problem.
 
I assume this is not good?
ERROR: failed to write bytenr 13577814573056 length 16384 devid 1 dev_bytenr 13439981355008: Operation not permitted

I am running as root of course.

Marc
-- 
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
 
Home page: http://marc.merlins.org/