Re: btrfs check help

[Hugo Mills <hugo@carfax.org.uk>]

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On Tue, Nov 24, 2015 at 03:28:28PM -0500, Austin S Hemmelgarn wrote:
> On 2015-11-24 12:06, Vincent Olivier wrote:
> >Hi,
> >
> >Woke up this morning with a kernel panic (for which I do not have details). Please find below the output for btrfs check. Is this normal ? What should I do ? Arch Linux 4.2.5. Btrfs-utils 4.3.1. 17x4TB RAID10.
> You get bonus points for being on a reasonably up-to-date kernel and
> userspace :)
> 
> This is actually a pretty tame check result for a filesystem that's
> been through kernel panic. I think everything listed here is safe
> for check to fix, but I would suggest waiting until the devs provide
> opinions before actually running with --repair.  I would also
> suggest comparing results between the different devices in the FS,
> if things are drastically different, you may have issues that check
> can't fix on it's own.
> >[root@3dcpc5 ~]# btrfs check /dev/sdk
> >Checking filesystem on /dev/sdk
> >UUID: 6a742786-070d-4557-9e67-c73b84967bf5
> >checking extents
> >checking free space cache
> >checking fs roots
> These next two lines are errors, but I'm not 100% certain if it's
> safe to have check fix them:
> >root 5 inode 1341670 errors 400, nbytes wrong
> >root 11406 inode 1341670 errors 400, nbytes wrong

   I think so yes.

> This next one is also an error, and I am fairly certain that it's
> safe to have check fix as long as the number at the end is not too
> big.
> >found 19328809638262 bytes used err is 1

   Agreed.

   Hugo.

> The rest is just reference info
> >total csum bytes: 18849042724
> >total tree bytes: 27389886464
> >total fs tree bytes: 4449746944
> >total extent tree bytes: 3075457024
> >btree space waste bytes: 2880474254
> The only other thing I know that's worth mentioning is that if the
> numbers on these next two lines don't match, you may be missing some
> writes from right before the crash.
> >file data blocks allocated: 19430708535296
> >referenced 20123773407232

-- 
Hugo Mills             | Great films about cricket: Umpire of the Rising Sun
hugo@... carfax.org.uk |
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