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By default, the Occurrence counter is disabled.
For enabling, you have to activate the switch and add one or more counter definitions to your BVQ alert condition.
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Figure 1: Use Occurrence counter |
After enabling the Occurrence counter, you can decide on a method to choose from → Consecutive violations or Violations per time
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INFO: Please note that a mixture of SLA and non SLA mode within a single Alert Condition is not possible.
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Figure 2: Differences between the options |
Illustration of the different methods:
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YELLOW: Only a certain amount of exceedances within a specified timeframe triggers an alarm. (Occurrence counter ON - Violations per Time) - (delayed trigger mode)
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Figure 3: Real Life example and illustration of the different methods |
This table describes the different options using a real-life example.
More detailed information about each option is given, as well as a description of how to activate one of the options.
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Figure 4: The different options using a real-life example |
When using the non-SLA - sliding window mode, the status of a rule varies, depending on the current value.
If in the next measurement the value falls below a critical value again, this will be reflected in the status of the alert rule and it will change from e.g. Error Level back to an OK state.
Relevant for this is the PI timing and the time specified in the Sliding window.
Here, an additional possibility has been created to maintain this state in the long term, over a certain SLA time interval. (fixed window)
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The main difference from the Sliding Window (used without the SLA option) is the fact that the state of the Alert rule remains.
By default, SLA mode is disabled. To enable it, change the SLA INTERVAL from "SLA mode not enabled" to the desired timeframe.
The following illustration shows the differences by means of a comparative analysis:
| Standart timing mode (sliding window) | SLA timing mode (fixed window) |
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| Intended to be used for normal monitoring purposes | Intended to prove the health of service level objectives. |
| Allows to define a separate Timing for each Occurrence counter definition | Forces all Occurrence counter definitions to use the configured SLA timing |
| Uses the timing for a sliding window - Time setting within the Occurrence counter definitions | Uses the timing for fixed window - Time setting for the SLA interval |
| Reset to default Alert level (typ. OK) when the measurements in the sliding window are below the counts of all Occurrence counter definitions. | Reset to default Alert level (typ. OK) at each start of the SLA interval fixed window. |
Figure 5: Standart timing mode versus SLA timing mode
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- ERROR at 3 ms
- Violations per time 5, 10, 20 occurrences per time
- consecutive violation by more than 5 occurrences
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Figure 6: Real-life example |
| BVQ Alert rule - SLA Mode not enabled (sliding window) | Each box represents a 1 hours sliding window and the color shows the current status | Explanation | ||
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| Name | SVC MDisk violated |
INFO: Each colored box represents a sliding window of 1 hour and indicates the current status by its color. | From 07:15 untill 08:55 the 3ms latency rule was exceeded 5 times. → Status Raised to ERROR The next upcoming 5 min PI measurements did also contain more than 5 violations of the 3ms latency rule. → Status still at ERROR From 09:15 the staus lowerded the severity because the 3ms latency rule is no longer exceeded 5 times in that 60 min sliding window. → Status WARN | |
| Perfomance indicator timing | 5 minutes | |||
| SLA interval | NONE (OFF) | |||
| AR Condition | Latency > 3ms | |||
| 1. AR Condition > 3 ms | ERROR
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INFO: Each colored box represents a sliding window of 1 hour and indicates the current status by its color. | ||||
Figure 7: Disabled SLA mode
| BVQ Alert rule - SLA Mode enabled (fixed window) | SLA interval of one day | Explanation | |||||||||
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| Name | Daily SVC MDisk SLA violated |
INFO: Each box shows by its color the status since the beginning of the day up to that moment. |
At 08:55 5 violations are counted this will raise the status to INFO At 09:10 10 violations of 3ms latency are counted so that the status will raise to WARN At 09:15 5 consecutive violations are happening. This will trigger our 4. alert rule and therefore the status will direclty raise to ERROR This status will be based on the SLA mode persistant untill the next start of the day. It will then be reset to
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| Perfomance indicator timing | 5 minutes | ||||||||||
| SLA interval | 1 day | ||||||||||
| AR Condition | Latency > 3ms | ||||||||||
| 1. AR Condition Occurrence counter | ERROR | 20 times per SLA interval | |||||||||
| 2. AR Condition Occurrence counter | WARN | 10 times per SLA interval | |||||||||
3. AR Condition Occurrence counter | INFO | 5 times per SLA interval | |||||||||
| 4. AR Condition Occurrence counter | ERROR | 5 times in a row per SLA interval | |||||||||
Figure 8: Enabled SLA mode
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