> 2) Does this work on NFS2 or its only for NFS3?
NFSv2 but its a convention
> 3) Suppose a process p1 opens a FIFO that is on a NFS
> file system. p2 writes some data to the FIFO and exits.
> If now file system is unmounted then will it give
> device busy error? If not then what will happen to
> the data that process p1 wrote to FIFO (and which is in
> kernel)?
if p1 closes it do the data vanishes
> 5) Can we provide support FIFO on a NFS file system for communicating
> between two processes on two different machines (of course by
> changing the semantics of IPC)? I mean is there any work in
> this direction?
No, use sockets
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