A data processing network, a cluster controller, a data processing node, methods and computer program products are disclosed. The data processing network comprises: a cluster controller operable to store a plurality of configurations; and a cluster of data processing nodes, said cluster controller and said cluster of data processing nodes being operable to co-operate to make one of said plurality of configurations available as an allocated read-only configuration to each data processing node in said cluster, each data processing node being operable to boot-up using said configuration, said cluster controller and cluster of data processing nodes being further operable to co-operate to allocate a read/write storage area for each data processing node in said cluster for accessing data to be utilized during operation of that data processing node following boot-up. This approach provides for the flexible set-up of a cluster that can dynamically load a specific configuration and automatically be operative on an undetermined number of active nodes. At the same time this approach allows a separation of the available machines so to be able to concurrently run different HPC services.