title: Azure VM: SQL Server database on OS Disk or Data Disk?
body: <p>I am busy migrating to Azure Virtual Machines.</p>
  
  <p>Should my SQL Server database MDFs reside on the OS disk or on a data disk (which, as far as I understand, is a page blob - also known as a Azure Disk Drive)? </p>
  
  <p>I would have thought the data disk was the correct place, but I've just read <a href="http://msdn.microsoft.com/en-us/library/windowsazure/jj156168.aspx" rel="nofollow">here</a> that it is slower than the OS disk.</p>
  
  <p>Furthermore, if I use a data disk then should the OS disk and data disk belong to the same storage account container for increased performance?</p>