Express queuing network model
An express queuing network model (E-QNM) estimates service performance against changes in business driver volumes or infrastructure configuration. This model is the simplest QN model and is completely automated. It can predict:
- Response time
- Queue length
These metrics are either computed for a single resource or for a complex network; predicted values are then automatically compared with the service levels specified as thresholds on response time and utilization.
The following table specifies the system resource types supported by QN models, including the corresponding metrics:
Model resource type
CPU utilization %
Memory utilization %
Disk utilization %
CPU % time waiting for I/O
The model wizard will enforce these constraints by preventing you from selecting unsupported metrics.
For more information about how to work with E-QNM, see the following topics: