Btrfs devel - Aug 2013 - Unmountable BTRFS with parent transid verify failed

Hi,

I have a 9 disk raid1 filesystem that is no longer mountable.
I am using ubuntu 13.04 with kernel 3.8.0-26-generic


What happened was that I was removing a device using
btrfs device delete
and this was running for quite a while (I was removing a 3T device)
but eventually this failed with the btrfs command segfaulting.

Now when I have rebooted but the filesystem does not mount.
When I run "btrfsck /dev/sde" I get a lot of

parent transid verify failed on 35344449986560 wanted 301481 found 301495
parent transid verify failed on 35344449986560 wanted 301481 found 301495
parent transid verify failed on 35344449986560 wanted 301481 found 301495
parent transid verify failed on 35344449986560 wanted 301481 found 301495
Ignoring transid failure
leaf parent key incorrect 35344449986560
leaf parent key incorrect 35344446398464
bad block 35344446398464

And while btrfsck eventually does complete  the filesystem remains unmountable.

Any advice ?


regards
ronnie sahlberg
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs"
in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

ronnie sahlberg posted on Sat, 31 Aug 2013 14:50:36 -0700 as excerpted:
> And while btrfsck eventually does complete  the filesystem remains
> unmountable.
> 
> Any advice ?
This isn''t specific to your question, but in general...

In the "Question: How can I recover this partition? (unable to find 
logical $hugenum len 4096)" thread about a week ago, there''s a
post from
Hugo Mills, listing the general troubleshooting steps he recommends and 
in what order.  I''d try that.

http://permalink.gmane.org/gmane.comp.file-systems.btrfs/27999

(I have it marked to possibly add the info to the wiki as I don''t 
remember seeing such a concise list there, but I haven''t gotten around
to
it yet.)

Wiki: https://btrfs.wiki.kernel.org/

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs"
in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

On Aug 31, 2013, at 4:01 PM, Duncan <1i5t5.duncan@cox.net> wrote:
> ronnie sahlberg posted on Sat, 31 Aug 2013 14:50:36 -0700 as excerpted:
> 
>> And while btrfsck eventually does complete  the filesystem remains
>> unmountable.
>> 
>> Any advice ?
> 
> This isn''t specific to your question, but in general...
> 
> In the "Question: How can I recover this partition? (unable to find 
> logical $hugenum len 4096)" thread about a week ago, there''s
a post from
> Hugo Mills, listing the general troubleshooting steps he recommends and 
> in what order.  I''d try that.
> 
> http://permalink.gmane.org/gmane.comp.file-systems.btrfs/27999
I was about to suggest the same thing, but also to use something newer than
3.8.0, and before getting to any of the btrfs specific commands to make sure a
recent btrfs-progs is being used. There have been lots of fixes between 3.8 and
3.10.


Chris Murphy--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs"
in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html