We have a number of home directory servers running CentOS 6 exporting XFS file 
systems over NFSv3

We enable user quotas for all users - with a relatively small allocation to 
each user

Every now and then, we get a user that has a quota mismatch - where they are 
(usually) over their quota, but their actual usage (via du) is significantly 
less

This happens on any of the servers

I suspect that the mismatch is probably due to file space being allocated on 
the server, but somehow not referenced by a file - may be by deleted files?, 
but lsof on the client doesn't show any suitable deleted files

The 'problem' usually resolves itself in a day or so - although I have no idea 
how or why etc ...

Has anyone seen an issue like this - or know of any XFS tools that could be run 
on the server to find and fix the missing quota allocation?

Thanks

James Pearson
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