NFS server stalls with 2.4.18 + XFS 1.1

We have noticed a problem with a couple of our NFS servers (running RedHat 7.2 with a stock 2.4.18 kernel with XFS v1.1) whereby NFS access slows to a crawl or stalls.

The exported filesystem(s) are XFS with 8 nfsd's running - when we have the problem the load average is about 8 - but CPU usage, disk access and network traffic are minimal.

I found, by accident, that running the command 'sync' appears to 'fix' the situation...

I'm not sure if this is an XFS or NFS related problem (hence posting to both lists).

Thanks

James Pearson

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