Network File System (NFS) is a distributed file system protocol that allows a user on a system (client) to access files over a network in a manner similar to how local storage is accessed. In one of our earlier tutorials, we learned nfs mount option in detail. Mainly there are 3 versions of NFS are currently available which are NFS v2, NFS v3 and NFS v4.
In this tutorial, I will show you how to check NFS version that a server or client running on Linux. We can use the command nfsstat to find the NFS version of the server/client.
1) Check NFS server version using nfsstat command
Nfsstat command can be used as follows.
# nfsstat –s
-s : Print only server-side statistics. The default is to print both server and client statistics.
Sample Output could be,
Server nfs: calls badcalls public_v2 public_v3 4330692 0 0 0 Version 2: (0 calls) null getattr setattr root lookup readlink read 0 0% 0 0% 0 0% 0 0% 0 0% 0 0% 0 0% wrcache write create remove rename link symlink 0 0% 0 0% 0 0% 0 0% 0 0% 0 0% 0 0% mkdir rmdir readdir statfs 0 0% 0 0% 0 0% 0 0% Version 3: (4330692 calls) null getattr setattr lookup access readlink read 197 0% 2569161 59% 166 0% 93521 2% 222594 5% 120 0% 1218751 28% write create mkdir symlink mknod remove rmdir 163494 3% 414 0% 543 0% 0 0% 0 0% 10 0% 0 0% rename link readdir readdir+ fsstat fsinfo pathconf 1 0% 0 0% 550 0% 45434 1% 15285 0% 177 0% 1 0% commit 273 0%
From the activity, you can find that the server is using NFS v3.
Find NFS statistics
Now let's see few other options of nfsstat command to find NFS statistics
Show all information about all versions (2 , 3 and 4) of NFS.
nfsstat -o all -234 or nfsstat --verbose -234
Show all information about active versions of NFS
nfsstat -o all
2) Find NFS client version
This can be found as follows.
# nfsstat –c
-c, --client : Print only client-side statistics.
Sample output could be
Client nfs: calls badcalls clgets cltoomany 753081 28 753081 0 Version 2: (0 calls) null getattr setattr root lookup readlink 0 0% 0 0% 0 0% 0 0% 0 0% 0 0% read wrcache write create remove rename 0 0% 0 0% 0 0% 0 0% 0 0% 0 0% link symlink mkdir rmdir readdir statfs 0 0% 0 0% 0 0% 0 0% 0 0% 0 0% Version 3: (748700 calls) null getattr setattr lookup access readlink 0 0% 140588 18% 61939 8% 184611 24% 150266 20% 8 0% read write create mkdir symlink mknod 35415 4% 58540 7% 11703 1% 562 0% 248 0% 0 0% remove rmdir rename link readdir readdirplus 3264 0% 0 0% 9 0% 0 0% 1165 0% 1219 0% fsstat fsinfo pathconf commit 33435 4% 7160 0% 3309 0% 55259 7%
Read Also:
- Linux NFS Mount Entry in fstab ( /etc/fstab ) with Example
- How to Force Unmount NFS Mounted Directory
- Difference Between NFS Soft And Hard Mount With Example
