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The simplified problem:

I have 3 servers on which I want to host virtual machines. Some VMs are more important than others.

Should I keep the important ones on a "high priority" server and the others on the other two servers? Or should I make servers with both very important and less important machines?

What is the best practice here and why?

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better organize HA between two servers and keeps the third as slave.

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I daresay that there is no real "best practice" for this.

However, if you can structure your virtual machines into a "high SLA host" and a "low SLA host" or similar, it is much easier to manage in the long run.

Amazon Web Services does something like this, Example: all t1.micro instances run on one host, all c1.xlarge instances run on one host, etc.

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