Thanks for the feedback. I have setup a second Linux VM (running RHEL 5.11) and Postgres 9.4. I ran some insertions today from a client running on Windows. The client does a loop of 30 updates.
I am seeing about 10-20% increase in latency in the case where DB is on NFS (over TCP) compared to directly on disk.
The other machine I am using to compare is running RHEL 6.5 and Postgres 9.4.
Are there any specific tests that are recommended to test that postgres over NFS works well?
I am planning on doing a few large data inserts and fetches.
With the little testing, the DB over NFS appears fine.