Updated SR ticket: Known issue with related catch all KB article.
I am surprised that this has been uncovered with more users adopting 5.1. We will use "Reconfigure for vSphere HA" or perform multiple attempts when encountering this behavior.
Thanks
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Hello Darryl,
As discussed over call this is a known behavior in vCenter Server 4.1.x, 5.0.x and 5.1.x.
I am sending you the Kb article
vSphere HA and FT Error Messages (1033634)
Since this is a known issue hopefully We are planning to get rid of this issue with the upcoming version of V center server we are still working on it.
I am going to close the case on temporary note In case you need help please reply to this email within twenty one days from now and I will schedule another call for you.