title: Virtualized SQL Server: Why not?
body: <p>The IT department where I work is trying to move to 100% virtualized servers, with all the data stored on a SAN.  They haven't done it yet, but the plan eventually calls for moving the existing physical SQL Server machines to virtual servers as well.</p>
  
  <p>A few months ago I attended the Heroes Happen Here launch event, and in one of the SQL Server sessions the speaker mentioned in passing that this is not a good idea for production systems.  </p>
  
  <p>So I'm looking for a few things:</p>
  
  <ol>
  <li>What are the specific reasons why this is or is not a good idea?  I need references, or don't bother responding.  I could come up with a vague "I/O bound" response on my own via google.</li>
  <li>The HHH speaker recollection alone probably won't convince our IT department to change their minds.  Can anyone point me directly to something more authoritative?  And by "directly", I mean something more specific than just a vague Books OnLine comment.  Please  narrow it down a little.</li>
  </ol>