Abstract
A multiserver queuing system with an unlimited buffer is considered. The customer arrival is described by the Markov arrival process. The service time has a phase-type distribution. The service may occur with errors. The service strategy is as follows. If the number of busy servers is higher than a certain threshold value at the moment of the customer arrival, then the customer is copied, and the copies are serviced by all the free servers. If the number of busy servers is not higher than this threshold at the moment of the customer arrival, then the customer is serviced by one server. Stationary distributions of the number of customers and the residence time within the system are obtained. The threshold’s influence on the main parameters of the system’s productivity is numerically investigated.
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