2 errors on scrub

2 errors on scrub

[Russell Coker]

The below is from a system running the Debian kernel 3.2.0-4-amd64 on a 120G 
Intel SSD.  What would these 2 errors be?

scrub device /dev/disk/by-uuid/7939c405-c656-4e85-a6a0-29f17be09585 (id 1) 
done
        scrub started at Thu Jan 10 06:00:02 2013 and finished after 295 
seconds
        total bytes scrubbed: 25.42GB with 2 errors
        error details: super=2
        corrected errors: 0, uncorrectable errors: 0, unverified errors: 0

I know you all recommend later kernels, I'm upgrading things as fast as I can.

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Re: 2 errors on scrub

[Hugo Mills]

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On Thu, Jan 10, 2013 at 11:38:45AM +1100, Russell Coker wrote:
> The below is from a system running the Debian kernel 3.2.0-4-amd64 on a 120G 
> Intel SSD.  What would these 2 errors be?
> 
> scrub device /dev/disk/by-uuid/7939c405-c656-4e85-a6a0-29f17be09585 (id 1) 
> done
>         scrub started at Thu Jan 10 06:00:02 2013 and finished after 295 
> seconds
>         total bytes scrubbed: 25.42GB with 2 errors
>         error details: super=2
>         corrected errors: 0, uncorrectable errors: 0, unverified errors: 0

   Looks like broken superblocks, from that message. There's probably
more information in your kernel logs.

> I know you all recommend later kernels, I'm upgrading things as fast as I can.

   Glad to hear it. :)

   Hugo.

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Re: 2 errors on scrub

[Russell Coker]

On Thu, 10 Jan 2013, Hugo Mills <hugo@carfax.org.uk> wrote:
>    Looks like broken superblocks, from that message. There's probably
> more information in your kernel logs.

The only BTRFS message I see in the kernel log is "btrfs: unlinked 3 orphans" 
which happens every time a cron job makes a snapshot of /home.  Why does it do 
that?

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Re: 2 errors on scrub

[David Sterba]

On Thu, Jan 10, 2013 at 11:38:45AM +1100, Russell Coker wrote:
> The below is from a system running the Debian kernel 3.2.0-4-amd64 on a 120G 
> Intel SSD.  What would these 2 errors be?
> 
> scrub device /dev/disk/by-uuid/7939c405-c656-4e85-a6a0-29f17be09585 (id 1) 
> done
>         scrub started at Thu Jan 10 06:00:02 2013 and finished after 295 
> seconds
>         total bytes scrubbed: 25.42GB with 2 errors
>         error details: super=2

The superblock errors are detected but not corrected right away, because
next transaction commit will overvrite it.

Does scub report the errors repeatedly?

There are no other scrub errors reported, I guess there are also no
relevant messages in syslog. During transaction commit scrub is paused,
so it's not possible to verify a half-made superblock.

>         corrected errors: 0, uncorrectable errors: 0, unverified errors: 0

david

Re: 2 errors on scrub

[Russell Coker]

On Thu, 10 Jan 2013, David Sterba <dsterba@suse.cz> wrote:
> >         total bytes scrubbed: 25.42GB with 2 errors
> >         error details: super=2
> 
> The superblock errors are detected but not corrected right away, because
> next transaction commit will overvrite it.
> 
> Does scub report the errors repeatedly?

Scrub reported the errors repeatedly, but now the errors have gone away (I 
have just done a few scrubs with no errors reported).  So it seems that 
something that happened in the mean time fixed it.

Thanks for your reply.

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