> PostgreSQL 9.1.6 on x86_64-unknown-linux-gnu, compiled by gcc (GCC) 4.4.6
> 20120305 (Red Hat 4.4.6-4), 64-bit

First, you should be using the latest update version.  You are currently
missing multiple patch updates.

> listen_addresses = '*'
> port = 5433
> max_connections = 350
> shared_buffers = 8GB

Try dropping shared_buffers to 2GB.  We've seen some issues on certain
systems with 8GB shared buffers.

-- 
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com


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