This paper analyzes a discrete-time finite buffer renewal input queue with multiple
working vacations where services are performed in batches of maximum size “b”. The service times both
during a regular service period and vacation period and vacation times are geometrically
distributed. Employing the supplementary variable and imbedded Markov chain techniques, we
derive the steady-state queue length distributions at pre-arrival, arbitrary and outside
observer’s observation epochs. Based on the queue length distributions, some performance
measures and waiting time distribution in the queue have been discussed. Finally,
numerical results showing the effect of model parameters on the key performance measures
are presented.