One thing to bear in mind is the recent attack against LAMP systems, which can somehow down an entire website. I don't know much, but I heard about it recently.

Neowin.net - Attack Against Linux Apache Servers Intensifying
Neowin.net - Mystery Malware Affecting Linux/Apache Web Servers

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Programmers are in a race with the Universe to create bigger and better idiot-proof programs, while the Universe is trying to create bigger and better idiots. So far the Universe is winning. - Rich Cook