Device heath check calculation
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Summary of Device Health Check Calculation
The Device Health Check Calculation assesses the performance of devices by categorizing their health status as Good, Average, or Poor. This is achieved through a systematic evaluation of subcategories and their associated metrics, enabling customers to monitor and maintain device performance effectively.
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Key Features
- Weighted Average Calculation: Device categories are evaluated based on the weighted average of subcategories, which in turn are based on performance indicators of device metrics.
- Performance Indicators: Indicators are classified into three categories: Good, Average, and Poor, with defined weight ranges and thresholds for classification.
- Formulas for Assessment: Subcategory performance is calculated using a specific formula that incorporates the weight of evaluation metrics.
Key Outcomes
By utilizing this calculation method, ServiceNow customers can:
- Identify device performance issues quickly, allowing for timely maintenance and upgrades.
- Understand how individual metric evaluations contribute to overall device health, facilitating targeted improvements.
- Make informed decisions based on clear performance classification, enhancing operational efficiency.
Device health calculation and categorization of performance as Good, Average, or Poor.
Calculating Device health check
Each category of the selected device is marked as Good, Average, or Poor by calculating the weighted average of the subcategories associated with the parent category.
Each subcategory’s performance is marked as Good, Average, or Poor by calculating the weighted average of the performance indicators of associated device metrics.
| Performance Indicators | Weight | Upper bound | Lower bound |
|---|---|---|---|
| Good | 1 | 1.67 | 1 |
| Average | 2 | 2.33 | 1.67 |
| Poor | 5 | 5 | 2.33 |
- Formula used to calculate the subcategory performance indicators
Sub-category performance indicator= (weight of evaluation metrics performance indicator)/total number of evaluation metrics for the subcategory)where,- Evaluation metric performance indicator: Performance indicator (Good, Average, Poor) of the evaluation metrics' value as defined in the metric definition table.
- Weight: Weight of the performance indicator. After all the subcategories are marked as Good, Average, and Poor. The performance of the category is calculated by the weighted average of subcategories performance indicator.
- Score range definition
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The following defines the performance range and its corresponding classification:
- Good if the performance indicator average value lies in the range of (1, 1.67)
- Average performance indicator average value lies in the range of (1.67, 2.33)
- Poor performance indicator average value lies in the range of (2.33, 5)
- Formula used to calculate the parent category performance indicator:
Category performance indicator= (sum of sub-category performance indicator weights)/total number of sub-categories)- Example
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Consider the following example for the calculating the performance indicator for Device performance category that has the following subcategories:
Table 2. Sample Device health check calculation Subcategory Metric Metric value Subcategory performance metric calculation Subcategory Performance indicator Disk Space Disk Usage 90 Subcategory performance indicator = 5 (Weight of Poor indicator) / 1 (total no. of evaluation metrics for the subcategory) Poor Battery Health Battery health Good Subcategory performance indicator = 1 (Weight of Good indicator) / 1 (total no. of evaluation metrics for the subcategory) Good Computer Restart Device uptime 1 Subcategory performance indicator = 1 (Weight of Good indicator) / 1 (total no. of evaluation metrics for the subcategory) Good Performance indicator for Device performance category.
- Subcategory performance indicators = Poor, Average, Good
- Sum of weight of subcategory performance indicators: (5 + 1 + 1) = 7 Performance indicator = 7 / 3 (no. Of subcategories) = 2.33
- Device performance category is Poor (as 2.33 falls under the Poor range)