You can add an unmanaged host to a cluster. Such a host is not currently managed by the same vCenter Server system as the cluster and it is not visible in the vSphere Client.


Launch the vSphere Client and log in to a vCenter Server system.


  1. Select the cluster to which to add the host and select Add Host from the right-click menu.
  2. Enter the host name, user name, and password, and click Next.
  3. View the summary information and click Next.
  4. Select what to do with the host’s virtual machines and resource pools.
    • Put this host’s virtual machines in the cluster’s root resource pool

      vCenter Server removes all existing resource pools of the host and the virtual machines in the host’s hierarchy are all attached to the root. Because share allocations are relative to a resource pool, you might have to manually change a virtual machine’s shares after selecting this option, which destroys the resource pool hierarchy.

    • Create a resource pool for this host’s virtual machines and resource pools

      vCenter Server creates a top-level resource pool that becomes a direct child of the cluster and adds all children of the host to that new resource pool. You can supply a name for that new top-level resource pool. The default is Grafted from <host_name>.


The host is added to the cluster.