I doubt you'll get much useful feedback because your question is too
broad for a mailing list answer. If you're looking for basic
performance guidelines, I recommend Greg Smith's "PostgreSQL 9.0 High
Performance" [1] (disclaimer: I used to work with Greg and got a free
copy), although I don't think he spent much time on running
virtualized (which certainly could affect things). Then if you have
*specific* hardware or query questions, this list is a great resource.
[1]: http://www.2ndquadrant.com/books/postgresql-9-0-high-performance/
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Maciek Sakrejda | System Architect | Truviso
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www.truviso.com