When I was building a vSphere 5.1 environment. The prevailing recommendation seemed to be to install SSO and vCenter on seperate servers. Some recommendations were based on environment size while other physical seperation seemed based more on seperating this young, essentially v1.0 product from the other core vCenter services. As I look at planning a new vSphere 5.5 environment I am seeing slightly different recommendations. Most seem to suggest keeping vCenter and SSO on the same VM. I wanted to make sure this is now the prevailing wisdom and what (if any) types of environments would seperation still be preferred. I'm looking for the appropriate architecture for this environment. A couple vCenters instances, 100 Hosts, 2000-3000 VMs.
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