Step 2 – Migration
Plan all the involved steps accordingly, evaluating the impact of new features and the improvements that can be applied to the current environment. An upgrade order of the virtual components should be established to avoid potential problems. For example, the vSphere platform requires first upgrading the vCenter Server then the ESXi hosts to avoid communication issues within vSphere components.
If you need to consolidate an SSO domain, this can be done only on vSphere 5.5 and involves a change of architecture since you need to deploy the PSC from embedded to external. Check out the VMware KB 2033620—How to repoint and re-register vCenter Server 5.1 / 5.5 and components at https://kb.vmware.com/kb/2033620 for SSO consolidation. ...
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