The Disk Space Usage Forecast report lets you predict how much disk space you need in the future based on current and historical growth rate trends. For more accurate forecasting, select the largest possible period of historical data and the shortest possible projection into the future.
The Disk Space Usage Forecast report does not display the maximum capacity of the disk. You can use this report to estimate how much space you need, but it does not indicate when existing space runs out.
When to run this report
Run the Disk Space Usage Forecast report to help anticipate your needs and plan for future acquisition of disk space.
Available forecast types
You can choose Linear or Exponential (Aggressive) forecasting types when you run this report.
Linear forecasting follows the trend of the available data and extends the forecast out in a straight line by the number of forecast units.
Exponential forecasting tends to exaggerate the trend that exists in the data. This allows you to more easily see if your data (disk space usage) is trending toward or away from a critical threshold. If the rate of growth is not constant, the exponential forecast type gives a more accurate forecast of future growth.
How SQL Diagnostic Manager calculates metric values on this report
Most values on the Disk Space Usage Forecast report correlate with the related SQL Server metric.
However, some metric values represent averages over time. Likewise, a few metric values are based on performance algorithms that use multiple statistics to calculate a more accurate metric.
You can access our Customer Support Portal for more information about the algorithm used to calculate a specific metric.
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