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To Share or not to Share that is the question.

We are installing a Historian with 2 or more machines for high availability.  Should they be on separate EXS instances or can they all go on the same box.  SQL will also be installed clustered with 2 or more servers.

These machines will also be dedicated 4 cores for each historian and 2 cores for SQL to start.  Possibly go to 4 if there is performance issues.  

The only issue i see on one single  ESX is, if ESX goes down so does the entire system.

Any other reasons not to put all the eggs in one basket, other than the obvious one to the powers that be.  Cost.

Thank you.

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