Removing a host from vCenter Server stops all the vCenter Server monitoring and managing activities. You should remove the managed host while still connected to remove the vCenter agent as well.

To remove a managed host, follow this procedure:

1. From the vSphere Client, log in to the vCenter Server that manages the host to remove.
2. Power off all running VMs, right-click on the host, and select Maintenance Mode | Enter Maintenance Mode. Click Yes to confirm.
3. Right-click on the host once again and select the All vCenter Actions | Remove from Inventory option. Click Yes to confirm the removal. The host and its VM are removed from the vCenter Inventory; the license assigned to the host is removed from the vCenter list and retained by the host.

When the host has been removed, the vCenter Server is no longer able to manage the host. To access the VM, you need to access the host directly.