Consider a system in which N users (each with his/her own PC) connect to an Application Server (AS) that runs on its own processor ASP.

On average, for each user request, the AS generates:

4 requests to a Database Server (DB) that runs on its own processor DBP, and

3 requests to a disk (Disk1) with an average disk service time of 0.03 sec per disk request.

The CPU demand is as follows:

for each user request, the AS demand is 0.125 seconds

for a DB request the CPU demand is 0.4 sec.

For every Database Server request DB generates:

1 request to Disk1 with an average service time of 0.04 sec per request.

0.5 requests to Disk2 with an average service time of 0.02 sec per request.

- Develop and design by hand a layered queueing network model and list its parameters.

Please either draw it or use drawing software.