It is a good idea to have a management cluster, usually consisting of a small number of ESXi hosts and this cluster is where your critical infrastructure virtual machines reside, such as the vCenter Server and database server (if external).
If you don't have this option, you can create some affinity rules to have a preferred 2 or 3 hosts to run vCenter on, and then if VC is down you only need to check on these 2 or 3 hosts.
Cheers, Matt.
VCP6-DCV | VCAP6-DCV Deploy
@mattallford
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