1. A method for managing a virtual tape library cluster by a processor device in a computing environment, the method comprising: enhancing a virtual tape library cluster by representing virtual tape resources in cluster nodes with a unique serial number; determining a least utilized cluster node; selecting one of the virtual tape resources represented within the least utilized cluster node; and upon receiving an error message, sending a test command to one of the virtual tape resources represented in each of the cluster nodes except of the cluster node of a failing virtual tape resource.