[lustre-discuss] 2.1 MDT recovery on test hardware

Christopher J. Morrone morrone2 at llnl.gov
Thu Jun 25 14:13:49 PDT 2015

I think the major problem is going to be that your MDT image is not 
terribly useful without the OSTs that belong to the MDT.  The new OSTs 
don't contain any of the objects that the MDT references.

Back at old Lustre 2.1 code you won't have any of the lfsck code that 
can deal with the MDT to OST inconsistency problems.  And even if you 
did, every file in your filesystem would be removed or moved to lost+found.

It is not immediately clear to me what amount of useful testing could be 
done under that situation.  Maybe there is something.


On 06/25/2015 01:06 PM, Crowe, Tom wrote:
> Greetings,
> I am investigating the possibility of restoring a DD backup of our MDT,
> onto test hardware. Our filesystem is 2.1 based.
> The general idea would be to get the MDT/MGS restored in their entirety,
> change the MGSNODE parameter on the MDT to reflect the test hardware
> LNET setup, add some new OST’s, have clients mount the new setup, and
> proceed with our testing.
> Is there a procedure that outlines this process? I suspect the exercise
> could be considered a disaster recovery test, but we do not have any
> intention at this time to relocate and/or recover any of the original OST’s.
> Thank You.
> -Tom Crowe
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