The "tcp" option may not be necessary but I haven't taken the time to
benchmark between TCP and UDP.
For gigabit ethernet, the nfs people recommend TCP.
From the man page for nfs (5):
WARNINGS
Using NFS over UDP on high-speed links such as Gigabit can cause silent data corruption.
The problem can be triggered at high loads, and is caused by problems in IP fragment reassembly. NFS
read and writes typically transmit UDP packets of 4 Kilobytes or more, which have to be broken up into
several fragments in order to be sent over the Ethernet link, which limits packets to 1500 bytes by
default. This process happens at the IP network layer and is called fragmentation.
They go into greater detail about this issue. For info use 'man 5 nfs'
-J
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