Nfs – How to identify which NFS client generates disk IO

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Our pool server disk is 100% busy.

I checked with iotop and determined that nfsd is the top process which consumes disk IO.

I need to narrow that down further and want to determine which of the NFS clients using the server is/are responsible for this disk IO bottleneck. How do I proceed?

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Best Answer

iotop and then o - you will see which process reads and/or writes and how much to the HDD.

Check the pid of that process and do netstat -entp | grep <pid> - that way you will see established tcp connection and from which address it's coming. Use enp to check for both tcp and udp sessions.

You can also do a netstat -anp | grep 2049 - that way getting an ip address and pid, then correlate the pid to the one from iotop.

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