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Greg Hewgill
Asked: 2009-11-10 14:11:32 +0800 CST

How to monitor NFS activity on a Linux server

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I've got a Linux server (Red Hat Enterprise Linux AS release 4) that is running nfsd. Is there a way to find out which file(s) are currently in use on the server?

Occasionally the server CPU usage spikes to over 100% and the only thing using a nontrivial amount of CPU time is nfsd. I'm curious to find out what is causing that activity.

linux

2 Answers

  1. I was able to get an idea of what files were being accessed using an indirect method:

    tcpdump -s 192 port nfs

    Among a serious amount of chaff, there are "lookup" packets that contain the filename that is being opened. This doesn't include the full pathname so it's still a bit of a guessing game, but it's better than nothing.

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  2. man lsof

    E.g., if the nfsd has the pid 2645, then do:

    lsof -p 2645
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