\input zb-basic \input zb-ioport \iteman{io-port 02026615} \itemau{Ianovsky, Edward; Kreimer, Joseph} \itemti{Optimization of real-time multiserver system with two different channels and shortage of maintenance facilities.} \itemso{Math. Comput. Simul. 63, No. 6, 615-627 (2003).} \itemab This paper deals with real-time systems (RTS) and is devoted to calculate limiting values of availability and loss penalty function for RTS with large number of servers. The authors obtain optimal assignment/routing probabilities which maximize/minimize these performance measures. They present both some numerical results and some ideas for further research. \itemrv{Messoud A. Efendiev (Berlin)} \itemcc{} \itemut{Assignment probabilities; Availability; Loss penalty; Maintenance; Real-time system} \itemli{doi:10.1016/S0378-4754(03)00092-2} \end