David Kerr wrote:
I don't think it's anything in the Db that's causing it. ( drop and re-create
the db between tests) I actually suspect a hardware issue somewhere.

You might find my "Database Hardware Benchmarking" talk, available at http://projects.2ndquadrant.com/talks , useful to help sort out what's good and bad on each server, and correspondingly what'd different between the two. Many of the ideas there came from fighting with SAN hardware that didn't do what I expected.

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Greg Smith  2ndQuadrant US  Baltimore, MD
PostgreSQL Training, Services and Support
g...@2ndquadrant.com   www.2ndQuadrant.us


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