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I just learn that using virtualisation (making one server act as many) saves a (lot) of energy - because of cooling the servers.

The example they gave was that 10 servers at 5% can be set to run on one server, and that is still only at 50%.

Does Stack Exchange use virtualisation for this, or are there many servers the load is split across?

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Does Stack Exchange use virtualisation for this, or are there many servers the load is split across?

9 physical servers for the Q&A sites.

Putting many servers on one box still means that are sharing CPU(s), memory and bandwidth, meaning that if one is put under load it effects all the others, badly.

Having 10 physical servers means 10x the CPU, memory and bandwidth, which can come really handy ;)

Virtualization is not a panacea - it uses shared resources. That can be fine if there is low utilization.

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    "which can come really handy" means when you DDoSed yourselves? :P stackstatus.net/post/115305251014/… – Tim May 14 '15 at 21:00
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    @Tim - more thinking about the time where we crashed 8 of the servers and no one outside the compnay noticed ;) – Oded May 14 '15 at 21:02
  • Hmm, impressive! – Tim May 14 '15 at 21:02
  • "we crashed" - yeah, we know it was you :D – Shadow Wizard is Ear For You May 15 '15 at 5:55

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