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Date: Sun, 07 Dec 2014 09:56:44 +0100
From: Tomasz Chmielewski <tch@virtall.com>
To: Chris Murphy <lists@colorremedies.com>
Cc: Btrfs BTRFS <linux-btrfs@vger.kernel.org>
Subject: Re: btrfs device delete missing - Input/output error
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On 2014-12-07 06:26, Chris Murphy wrote:
> On Sat, Dec 6, 2014 at 2:17 AM, Tomasz Chmielewski <tch@virtall.com> 
> wrote:
> 
>> After we run again btrfs device delete missing /home, the newly 
>> created
>> directory eventually (/home/backup/ma-int/weekly.tmp) is being 
>> detected as
>> "csum failed ino ...".

> If that comes up clean then chances are this is file corruption and
> you can mount and do:
> 
> btrfs scrub start -r <MP>

Actually, this seemed to be enough.

I didn't realize that scrub would print the names of corrupted files.

After removing them, "btrfs device delete missing" is finally making 
some progress (previously, it would break at 300+GB; still running now):

# btrfs fi show /home
Label: none  uuid: 92e93437-cc9f-475d-a739-085f3270896b
         Total devices 3 FS bytes used 1.40TiB
         devid    2 size 1.70TiB used 1.42TiB path /dev/sdb4
         devid    3 size 1.70TiB used 807.00GiB path /dev/sda4
         *** Some devices missing

Btrfs v3.14.2


Thanks for your hints!

-- 
Tomasz Chmielewski
http://www.sslrack.com