XFS Quota Usage Mismatch On CentOS 6 ?

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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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