4.1 Monitoring supported by SLM
The data obtained by monitoring the monitoring items (average response time, throughput, and error rate) is characterized as the service performance. Service performance represents one second's worth of data, which means that service performance is measured 60 times per minute.
SLM enables you to perform out-of-range value detection and SLO monitoring on the basis of the monitoring items. The following table describes out-of-range value detection and SLO monitoring.
No. |
Monitoring (detection) type |
Description |
|
|---|---|---|---|
1 |
Out-of-range value detection |
If the performance of a monitored service varies significantly from what is typical, this monitoring method regards such a condition as an early warning sign of a potential service performance error. |
|
2 |
SLO monitoring |
Trend monitoring |
This monitoring method determines trends in the performance of a monitored service and uses the trends to predict overages of a service performance threshold. |
Threshold value monitoring |
This monitoring method detects an overage of a service performance threshold for a monitored service. |
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When out-of-range value detection, trend monitoring, and threshold value monitoring are all performed, a warning is displayed by out-of-range value detection and trend monitoring whenever the possibility of a service performance error in a monitored service is suspected. If you take an appropriate corrective action at this early stage, you can prevent the service performance error from occurring. Once a service performance error has occurred, it is displayed by threshold value monitoring. In such a case, immediate corrective action is assumed to be called for.