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On my SLES 10, SLES 11, and CentOS 6 servers, I'm able to list information about each NFS mount via nfsstat -m, e.g.:

/usr/local from nfssrv1:/vol/foo
 Flags: rw,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,hard,nolock,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=blah,mountvers=3,mountport=4046,mountproto=udp,addr=blah

We've got some older SLES 9 servers running kernel 2.6.5, and they report back "invalid option -m" when I try that command, so its not supported on the older nfs clients. How can I find out what flags are being used on these servers?

My goal is to compare the default mount options between servers to troubleshoot some NFS issues in our environment.

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up vote 1 down vote accepted

Look in /proc/mounts.

# grep nfs /proc/mounts
nas-0-0:/export/storage /storage nfs rw,vers=3,rsize=8192,wsize=8192,soft,intr,proto=tcp,timeo=600,retrans=2,sec=sys,addr=nas-0-0 0 0
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Thats it, thanks! – Banjer Jun 6 '12 at 19:55
Just mount by itself shows some flags, but /proc/mounts has more info. – Banjer Jun 7 '12 at 12:10

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