Red Hat 5/6 when I do mount it says type nfs, I would like to know how to determine version if it isn't listed in mount options or fstab. Please don't say remount it with the version option, I want to know how to determine the currently mounted NFS version. I am guessing it will default based on NFS server/client settings, but how to I determine what it is currently? I am pretty sure it's NFS v3 because nfs4_setfacl is not supported it seems.
Here are 2 ways to do it:
$ mount -v | grep /home/sam mulder:/export/raid1/home/sam on /home/sam type nfs (rw,intr,tcp,nfsvers=3,rsize=16384,wsize=16384,addr=192.168.1.1)
$ nfsstat -m | grep -A 1 /home/sam /home/sam from mulder:/export/raid1/home/sam Flags: rw,vers=3,rsize=16384,wsize=16384,hard,intr,proto=tcp,timeo=600,retrans=2,sec=sys,addr=mulder