To know nfs version in linux/solaris:

• On the nfs server side, you can run a nfsstat -s to check. The used version of nfs will have data summary other than 0% ones, as the following:

[email protected]# nfsstat -s
Server rpc stats:
calls badcalls badauth badclnt xdrcall
28 0 0 0 0

Server nfs v3:
null getattr setattr lookup access readlink
3 11% 4 14% 0 0% 1 3% 4 14% 0 0%
read write create mkdir symlink mknod
0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
remove rmdir rename link readdir readdirplus
0 0% 0 0% 0 0% 0 0% 0 0% 2 7%
fsstat fsinfo pathconf commit
9 33% 4 14% 0 0% 0 0%

• On the nfs server, we can also have a checking on what versions(2/3/4) and transport protocols(tcp/udp) the nfs supported with the command “rpcinfo -p localhost|grep nfs”:

root@doxer# rpcinfo -p localhost|grep nfs
100003 2 udp 2049 nfs
100003 3 udp 2049 nfs
100003 4 udp 2049 nfs
100003 2 tcp 2049 nfs
100003 3 tcp 2049 nfs
100003 4 tcp 2049 nfs

• On the nfs client hosts, you can run a nfsstat -c to check the version the client is using. As always, the used version of nfs will have data summary other than 0% ones, as the following:

[email protected]# nfsstat -c

Client rpc:
Connection oriented:
calls badcalls badxids timeouts newcreds badverfs
1219760 322812 0 0 0 0
timers cantconn nomem interrupts
0 322808 0 0
Connectionless:
calls badcalls retrans badxids timeouts newcreds
0 0 0 0 0 0
badverfs timers nomem cantsend
0 0 0 0

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%

Client nfs_acl:
Version 2: (0 calls)
null getacl setacl getattr access
0 0% 0 0% 0 0% 0 0% 0 0%
Version 3: (4382 calls)
null getacl setacl
0 0% 4382 100% 0 0%

• Also, you can run nfsstat -m on nfs client hosts to print information about each of the mounted NFS file systems(the output info has nfs version indicated also):

[email protected] # nfsstat -m
/apps/uriman/tmp from doxer:/export/was/trncsc_cell_urimantmp
Flags: vers=3,proto=tcp,sec=none,hard,intr,link,symlink,acl,rsize=32768,wsize=32768,retrans=5,timeo=600
Attr cache: acregmin=3,acregmax=60,acdirmin=30,acdirmax=60