1. A method comprising: a logical-server manager program interacting with hardware to concurrently display on a display representations of respective logical servers and representations of respective real servers, said real servers including at least one hardware server and at least one virtual server, said logical servers being stored in a logical-server database specifying respective resource requirements and respective network identities for said logical servers, said logical servers being deployable to physical or virtual real servers, said logical servers not being physical or virtual real servers; an administrator selecting a first representation of a first logical server for deployment on a real server; said logical-server manager program responding to the selection by representing on said display a warning symbol in association with a representation of a first real server; said administrator interacting with said warning symbol; and said logical-server manager program responding to said interacting by displaying a message specifying that said first real server is unsuitable or impaired as a host for deployment of said first logical server, said message indicating that said real server fails to meet resource requirements of said logical server, said resource requirements being specified in said logical-server database.