1. A cluster arrangement comprising: a first network (NW 1 ); at least two data processing systems which each form an application node (AK) and which each have an operating system (OS), where an application node (AK) has an entity (I 1 , I 2 , I 3 , I 4 ) which is executed; and an application agent (AA) on each application node (AK), which has the following functions: monitoring (UB) and identifying entities (I 1 , I 2 , I 3 ) executed on the application node (AK); starting (ST) a new entity (I 3 ) or restarting an entity which has been terminated prematurely on the application node; assessing (BE) and deciding whether it is possible to execute a new entity (I 3 ) on the application node (AK); putting a request (AF) for execution of an entity to application agents (AA) at application nodes connected to the network (NW 1 ); and reporting (ME) to application agents (AA) at application nodes (AK) connected to the network (NW 1 ) following an acceptance of the request (AF) for execution of an entity (I 3 ).