Tag Archives: admission control

Helpful script of the day: HA calculations

I’m seeing a lot of posts on different forums about VMware HA.

Some people, including myself, have been receiving error messages when trying to power on a vm in a HA cluster like this one:

“Insufficient resources to satisfy HA failover level on cluster x in y”

Some fellow bloggers have preceeded me in providing clear explanations on how HA actually calculates this sort of thing. For instance:


Now, I still see a lot of replies from people that are having difficulties calculating exactly what happens in their situation. For those people, I have created a Powershell / VI Toolkit (beta) script that does the math and shows you exactly what is going on in your cluster.

So, download it, try it, and please send me some feedback if you have questions, remarks or problems.


Hope this helps.