I was just made aware of this issue with the vSphere 5.1 performance history charts. The symptoms are straight forward:

  • You see only the last 30 days of performance history in the ‘past year’ view
  • Only one month of performance history appears when trying to see the past year

VMware is working on a solution for the problem currently. It seems the problem has been identified (stored procedure purging data) and hopefully a fix will be released soon.

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--> Please see the rest on the blog : http://www.yellow-bricks.com/2012/12/30/vsphere-5-1-performance-history-issue