Will "btrfs scrub" clear corrupt filesystem trees?

Will "btrfs scrub" clear corrupt filesystem trees?

[Martin]

I have 1.5TB of data on a single disk formatted with defaults. There
appears to be only two directory trees of a few MBytes that have
suffered corruption (due to in the past too high a sata speed causing
corruption).

The filesystem mounts fine. But how to clear out the corrupt trees?

At the moment, I have running:

btrfsck --repair --init-extent-tree /dev/sdc

parent transid verify failed on 911904604160 wanted 17448 found 17449
parent transid verify failed on 911904604160 wanted 17448 found 17449
parent transid verify failed on 911904604160 wanted 17448 found 17449
parent transid verify failed on 911904604160 wanted 17448 found 17449
Ignoring transid failure

... And it is still running after over two days now. Looped?


Would a:

btrfs scrub start

clear out the corrupt trees?

Must I wait for the btrfsck to complete if it is recreating an extents
tree?...


Suggestions welcomed...

Martin

Re: Will "btrfs scrub" clear corrupt filesystem trees?

[Chris Murphy]

On Oct 10, 2013, at 12:27 PM, Martin <m_btrfs@ml1.co.uk> wrote:

> I have 1.5TB of data on a single disk formatted with defaults. There
> appears to be only two directory trees of a few MBytes that have
> suffered corruption (due to in the past too high a sata speed causing
> corruption).
> 
> The filesystem mounts fine. But how to clear out the corrupt trees?

If you've already gone through Hugo's list, I think it's a matter of waiting for further development for fixing such problems.

> 
> 
> Would a:
> 
> btrfs scrub start
> 
> clear out the corrupt trees?

I don't think so.


> 
> Must I wait for the btrfsck to complete if it is recreating an extents
> tree?…


Yes because scrub is online/mounted, and btrfsck is offline/unmounted.

Chris Murphy