How to monitor which files are accessed through NFS?

Question

I have a linux file server running CentOS 6. Files are accessed via NFS4.

Sometimes I have problems with disk io load. I want to find out what is causing them.

I can find out which client is causing them with tcpdump and nfsiostat (on the clients). But I want to know either which files are accessed or which process is doing the accesses. Then I can think about a solution for it.

I have tried to use wireshark to decode the accesses, but it is hard to read when open and read/write are not close together or you have lots of files with similar names (directories are not shown, just dir handles). If you have a lot of activity it would be nice to have a way to sort files by activity to find out what is the culprit.

Does anybody know of a solution for this?

Do you want to look on the client or the server? – womble Jul 23 '12 at 01:06 — womble, Jul 23 '12 at 01:06
I have the same problem and want to find out on the server. – peschü Oct 17 '18 at 11:50 — peschü, Oct 17 '18 at 11:50

score 3 · Answer 1 · answered Jul 23 '12 at 00:38

3

You can use either lsof or ftop (the last one is on EPEL repo)

For example:

lsof -N /mnt/nfs/*

HTH

answered Jul 23 '12 at 00:38

sebelk

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score 0 · Answer 2 · answered May 31 '23 at 18:33

0

NFSv4 open files and leases can be seen from file /proc/fs/nfsd/clients/CLIENT_ID/states, for example by running:

grep . /proc/fs/nfsd/clients/*/states

NFSv3 and older clients seem to be not included unfortunately.

answered May 31 '23 at 18:33

Zouppen

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score -1 · Answer 3 · answered Jul 23 '12 at 02:17

-1

A good start is to use/install iotop, i find it very handy for similar problems.

answered Jul 23 '12 at 02:17

Jason Leschnik

1

A late comment, but this seems to be for local disks, and not NFS. – DarkNeuron Nov 05 '18 at 09:17

How to monitor which files are accessed through NFS?

3 Answers3