We have not, AFAICT, had any problems with the traffic over NFS as far as reliability -- I'm sure there is a performance penalty, but the reliability and scalability gains more than offset that.
My experience agrees with yours. However we did find one gotcha -- see the thread starting here for details:
http://archives.postgresql.org/pgsql-hackers/2004-12/msg00479.php
In a nutshell, be careful when using an nfs mounted data directory combined with an init script that creates a new data dir when it doesn't find one.
FWIW, if I were to do this anew, I would probably opt for iSCSI over GigE with a NetApp.
Any particular reason? Our NetApp technical rep advised nfs over iSCSI, IIRC because of performance.
Joe
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