All: I am being advised by a consultant that there is a need to have a 1:1 ratio of dedicated host processors to virtual domain controller processors when running Active Directory in a virtualized infrastructure. If I cannot get a 1:1 ratio, I am being told that Exchange, lync, etc. need to not share the processors that the Domain Controllers are using on the hypervisor or it can cause performance issues on the domain controller.
I am trying to find official documentation from Microsoft or hypervisor vendor that states this so that I can bring it to management to dedicate the proper resources in the hypervisor for hosting virtualized DC’s. I am going to have a difficult time convincing my management to dedicate all of the necessary real processors in the virtual infrastructure to my DC’s or at least keep other services from sharing the processors used by my virtualized domain controllers without some sort of documentation stating this. I have tried to Bing/google it but have not been able to find the statement anywhere. Does anyone know where that declaration is located or is this just a general rule of thumb or “best practice” and is not necessarily a law? Or, is this incorrect advice? Brian Britt