I am moving to a cloud infrastructure with VCAC for self-provisioning. How does this impact my target utilization for my HA cluster? Previously I was targeting running each cluster at 80% utilization of RAM and CPU on each host for average peak utilization. now I am going to allow vms to be self-provisioned. I won't control the provisioning process anymore but various clients and tenants can provision VMs at will without my notice. As a result, I have to be able to have capacity available more quickly to add VMs, and not suddenly run out of cluster capacity. I want to minimize waste by running my clusters to capacity, but I also need to maximize elasticity. What are some guidelines on how to do this? Anyone have experiences to share -
1. what did you pick as a target utilization figure and why ?
2. how did you capacity plan / forecast for cluster capacity?
3. did you use admission control?