You might want to rediscover a host if you modify the host platform, modify the network, add or remove datastores, or add or remove resource pools. Rediscovery automatically adds any new Network, Datastore, or Resource Pool resources; however, it does not remove the old resources.
To rediscover one or more hosts:
In the Web Interface, select to Resources > Hosts.
Select one or multiple hosts in the Hosts list.
In the actions above the list, click Rediscover to initiate rediscovery for each of the selected hosts.
To rediscover a single host:
In the Web Interface, select to Resources > Hosts.
In the Hosts lists, select the host, then click Edit.
In the header area, note the Sub Status Discovered.
Click Rediscover to initiate rediscovery.