It's in this doc...
http://www.vmware.com/pdf/vi3_301_201_resource_mgmt.pdf
Primary and Secondary Hosts
When you add a host to an HA cluster, that host has to communicate with a primary host in the same cluster to complete its configuration (unless it’s the first host in the cluster, which makes it the primary host). The first hosts in the cluster become primary hosts, all others are secondary hosts. When a primary host goes down or is removed, HA automatically promotes another host to primary status. Primary hosts help to provide redundancy and are used to initiate failover actions.
If all the hosts in the cluster are not responding, and you add a new host to the cluster, HA configuration fails because the new host cannot communicate with any of the primary hosts. In this situation, you must disconnect all the hosts that are not responding before you can add the new host. The new host becomes the first primary host. When the other hosts become available again, their HA service is reconfigured.
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Thanks, Eric
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