I am looking to install a fresh install of vSphere 6.x at a new site with an external PSC and then come back to the existing vpshere 5.5 with the external SSO and upgrade afterwards. If I install the new 6.x site first with an external PSC can I then go back to the 5.5 site with the external SSO and join the 6.x site during the upgrade so that I use that PSC instead of having two?
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