Maybe we need to actively discourage people from running Postgres
against NFS-mounted data directories.  Shane Kerr's paper cited above
mentions some other rather scary properties, including O_EXCL file
creation not really working properly.

Wouldn't you be describing a Linux-specific issue, though? And possibly kernel-specific?

It's hard to reconcile this with the real-world performance of PostgreSQL on NFS, which is happening all over the place. Most notably, Joe Conway's 20,000 txn/sec.

I *do* think it's an accurate statement that if you're going to use Postgres, or any other OLTP database, on NFS you'd better have access to a NAS expert. But to say that it's a bad idea even if you have expert help is probably going to far.

--Josh Berkus

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