Using TCP protocol for NFS mount points on linux servers

peedee asked:

I’m trying to use TCP protocol for better performance for NFS mounts but currently /proc/mounts says its using TCP protocol? does that mean NFS is already using TCP by default?

nfs v3: /mnt/test2 nfs rw,vers=3,rsize=32768,wsize=32768,soft,proto=tcp,timeo=600,retrans=2,sec=sys, 0 0

My answer:

Red Hat Enterprise Linux defaults to using TCP to transport NFS.

TCP is the default transport protocol for NFS version 2 and 3 under Red Hat Enterprise Linux. UDP can be used for compatibility purposes as needed, but is not recommended for wide usage. NFSv4 requires TCP.

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