The storage system of a small company is composed by two NAS. Each of them is configured to serve requests in parallel (i.e. processor sharing), and serves two type of users: employees and costumers. Requests of both type of users arrive according to Poisson processes respectively of rates:
lE = 0.1 req./s. lC = 10 req./s.
Each request accesses files from both NAS. The demand of the two NAS for the two types of users have been measured as follows:
D1E = 2 s. D1C = 0.06 s.
D2E = 5 s. D2C = 0.04 s.
Determine:
1. If the considered system is stable
2. The utilization of the two NAS
3. The residence time of the two NAS
4. The system response time
