[Lustre-discuss] Data corruption?

[Brian J. Murrell]

On Fri, 2009-03-27 at 09:31 -0500, Nirmal Seenu wrote:
> Could someone help me understand what the following error messages mean:
> 
> When I do a "ls -l" I get ? in all the fields but for the filename on 
> some of the files:
> 
> ?--------- ? ?     ?            ?            ? cart_wengen.odd_even.txt

Looks like you have some synchronicity problems between your MDT and
your OSTs.

> I recently moved the MDT to a different partition.

Hrm.  How did you do that?  Did you lose some information in the move
perhaps?

> I performed a lfsck 
> on the the file system and got these errors from lfsck:
> 
> /aa/bb/cc/dd/xx/cosmology.c object 8024 not created

Like just that one or lots of them?  I'd think you should see one for
that file you reference above: cart_wengen.odd_even.txt

In any case, that message means you have metadata but no object data for
a file.

> I keep getting the following error message on all the OSTs:
> Mar 27 08:21:57 lustre2 kernel: LustreError: 
> 6886:0:(ldlm_resource.c:858:ldlm_resource_add()) lvbo_init failed for
>   resource 301930: rc -2

Yeah.  Same thing.  A client is asking for an object that doesn't exist.

Assuming you don't have some ongoing problem with OSTs objects going
missing for whatever reason, lfsck should clear all of this up.

b.

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