The Event Hub grid application is started and stopped just as any other grid module.
When you start the Even tHub module, persisted events are routed to any subscriber that has not already received the event. Thus the state of the Event Hub is preserved. If an event has been received by all subscribers, it will be removed from persistence. Events are continuously persisted. For each subscriber the subscriber name, subscriptions, and internal IDs for sent events are also continuously persisted.