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Performance Forecast for Datastores

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This report forecasts free and provisioned space, latency and IOPs resource utilization for datastores.

Description

The Performance Forecast for Datastores report forecasts how many days remain before the level of resource utilization reaches the specified threshold values. The report allows analyzing the following datastore resource utilization parameters: free space, provisioned space, read and write latency, disk IOPs.

To calculate future datastore performance, the report analyzes historical performance data for the specified period in the past, calculates the performance utilization trend and applies this trend to the forecast horizon. For better forecast accuracy, along with the performance trend the report provides trend’s confidence interval that represent the best- and worst-case scenarios. This allows you to estimate various possible outcomes and helps you rationally plan your resources.

If one or more specified thresholds are breached within the forecast interval, the report marks the datastore as problematic and lists constraining resources for it. The report also provides recommendations on appropriate resource allocation to prevent possible resource shortfalls in future.

Parameters

Performance Data From: defines a date in the past starting from which historical performance data will be used to calculate the performance trend. The report analyzes historical performance data starting from this date to the current date (data collection period).

noteNote

To make a forecast, the report must use historical performance data for at least 72 hours.

Forecast Horizon: defines the forecast period. The calculated performance utilization trend is applied to the time interval that starts from the current date to the forecast horizon date.

noteNote

The date in the Forecast Horizon field must be a date in future.

Show details: defines whether the report will display expanded or collapsed charts.

Mode: defines whether the report will display all results or problematic areas only (problematic areas are datastores for which resource utilization thresholds will be breached within the forecast period).

Scope: defines a list of Groups or Objects that will be analyzed in the report (by default, the VMware Datastores group is selected).
The Add Group option returns a Group and all objects that a group contains. The Add Object option returns only the selected object.

Threshold: Datastore Free Space (%): defines the free space threshold as a percentage of total available datastore space.

Threshold: Datastore Provisioned Space (%): defines the provisioned space threshold as a percentage of total available datastore space.

Threshold: Datastore Max Device Read Latency (ms): defines the maximum read latency threshold in millisecond.

Threshold: Datastore Max Device Write Latency (ms): defines the maximum write latency threshold in millisecond.

Threshold: Datastore IOPS: defines datastore IOPS threshold.

Aspects to be Analyzed: defines what types of metrics will be analyzed in the report (Free Space, Provisioned Space, Max Device Read Latency, Max Device Write Latency or IOPS).

noteNote

If you choose not to analyze an aspect, the report will ignore the threshold specified for this aspect.

Sample Usage

Forecast the number of days left before the amount of free space on the selected datastores reaches 30%, provisioned space reaches 150%, max read and write latency reach 70 and 85ms correspondingly, and datastore IOPS reach 900. Make sure that these thresholds will not be breached within the next 30 days. Use the historical performance data for the previous month to calculate the resource utilization trend.

Instructions

1.Open the Performance Forecast for Datastores report.
2.From the Performance Data From list, choose Previous Month > First Day.
3.From the Forecast Horizon list, choose a date in future (30 days from today).
4.From the Show details list, select Expand Charts.
5.From the Mode list, select Show problematic areas only.
6.In the Scope section, select VMware Datastores and click Remove. Then search for available datastores to include in the report.

Click Add Object. In the Add Object window, click Options. In the Options window, click Add. In the Class Name search box, type “datastore” and click Search. Select the VMware Datastore class in the list of search results, click Add and click OK. In the Options windows, click OK to apply the filter. In the Add Object window, click Search. The search will return a list of objects that belong to the VMware Datastore class. Select the necessary datastores in the list, click Add and click OK.

7.In the Threshold: Datastore Free Space (%) field, type 30.
8.In the Threshold: Datastore Provisioned Space (%) field, type 150.
9.In the Threshold: Datastore Max Device Read Latency (ms) field, type 70.
10.In the Threshold: Datastore Max Device Write Latency (ms) field, type 85.
11.In the Threshold: Datastore IOPS field, type 900.
12.In the Aspects to be Analyzed field, select all aspects.
13.Click Run to view the report.

Report Output

The Virtual Infrastructure Described table will provide an overview for all datastores included in the report scope: total capacity, amount of free and provisioned space, amount of space consumed by unknown files and the number of VMs residing on the datastores.

The Performance Forecast Analysis and Recommendations table will provide the following details for every datastore:

Column

Description

Name

Name of the datastore.

Analysis Result*

Result of the prediction analysis. Possible analysis results are:

Passed means that the resource thresholds will not be breached within the forecast period.
Failed means the resource thresholds will be breached within the forecast period or have already been breached within the data collection period.

Constraining Resource*

Resource for which the specified threshold will be breached first within the forecast period.

For example, both Datastore Free Space (%) and Datastore Provisioned Space (%) thresholds will be breached within the forecast period and the Datastore Free Space (%) is reported to be breached first. In this case, the report will display Free Space as the constraining resource. However, the Recommendations will be provided both for Free and Provisioned Space resources.

Days Left

Number of days left before the constraining resource threshold is breached. The number of days is shown as the worst-to-best case range.

Recommendations*

Recommendations on appropriate resource allocation.

Recommendations for a resource will be provided in case the specified threshold for the resource is breached within the forecast period or has already been breached within the data collection period.

*Provided results and recommendations are based on the worst-case scenario.

The Overall Recommendations table will provide recommendations for all datastores included in the report scope.

Details

Report details will provide in-depth forecast information for every datastore included in the report scope.

The Virtual Infrastructure Described table will provide an overview for the datastore: total capacity, amount of free and provisioned space, amount of space consumed by unknown files and the number of VMs residing on the datastore.

The Performance Forecast section will show a chart and a details table for each analyzed datastore resources.

The performance forecast charts will display the following types of data series for the analyzed data collection period:

Trend and its deviation represent resource utilization trend and the 95% confidence interval for it. The upper border of the confidence interval represents the best-case scenario. The lower border of the confidence interval represents the worst-case scenario. The width of the interval between the best and worst-case series depends on the variability of the collected historical performance data (the greater the variability, the wider the interval).

noteNote

This is true for the “floor” threshold only (Datastore Free Space). For the “ceiling” thresholds (Datastore Provisioned Space, Datastore Max Device Read Latency, Datastore Max Device Write Latency) upper border will represent the worst-case scenario.

Value represents the historical performance data for the data collection period (for example, how the amount of datastore free space has changed within the analyzed period)
Threshold represents the threshold specified for the datastore resource
Capacity represents the total datastore capacity capacity (will be displayed only for the Free Space performance forecast chart)

The Provisioned Space, IOPS, Max Device Read and Write Latency performance forecast charts will display the Trend and its deviation, Value and Threshold types of data series for the analyzed data collection period.

The performance forecast tables will provide the following details for the datastore resources:

Column

Description

Aspect

Name of the analyzed resource

Threshold

Specified threshold value

Prediction

Prediction on whether the resource threshold will be breached within the forecast period. Possible prediction values are:

Threshold will be achieved means that threshold will be achieved within the forecast period in both worst- and best-case scenarios.
Threshold may be achieved means that only worst-case data series will breach the threshold within the forecast period.
Threshold will not be achieved means that neither best-case nor worst-case data series will breach the threshold within the forecast period.
Threshold is achieved means that the trend line has already breached the threshold.

Days Left

Number of days left before the specified threshold is breached. The number of days is shown both for the worst-case scenario and best-case scenario.

Metric Forecast

Predicted metric value on the forecast horizon date (that is, at the end of the forecast period). The metric value is shown both for the best-case scenario and worst-case scenario.

Available Resources

Amount of non-consumed resources on the forecast horizon date (that is, at the end of the forecast period):

The amount of available resources is calculated as the difference between the specified threshold value and the metric forecast value. Positive values mean that spare resources will be available. Negative values mean that extra resources are required to survive

The values are shown both for the best-case scenario and worst-case scenario.

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