Future saturation recommendation
The Future saturation recommendation detects entities such as virtual clusters and hosts for which the resource usage has already exceeded thresholds or is expected to exceed them. The recommendation is generated by evaluating the natural (organic) growth of resource usage in your cluster due to workloads or deployment of new projects. It is based on the historical trending and extrapolation to the future.
The Future saturation recommendation is available for these technologies: Hyper-V, vSphere, and OpenStack
The following recommendation details are provided only when you apply Service Pack 1 (11.5.01) of TrueSight Capacity Optimization 11.5:
- Number of days that are remaining for the resources saturation
- Recommended actions to resolve the resource saturation
- Comparison between the current resource usage and trend and the estimated future usage after reconfiguring the VM
- Criteria used for generating the recommendation
- Indicator thresholds used for the recommendation
You can analyze these recommendation details and take the appropriate action to resolve the resource saturation problem.
The recommendation rule is based on the following metrics:
- CPU Utilization in MHz
- Memory Utilization %
- Total datastore space used
The warning threshold values that are configured for these metrics are used for the recommendation. These threshold values can differ for each technology. You can configure them on the Thresholds page in the TrueSight Capacity Optimization console.
For more information about configuring thresholds, see Configuring and managing thresholds for metrics and indicators.
The recommendation state is marked as critical if the resource saturation is expected to occur within the next 7 days or warning if it is expected to occur within the next 8 to 45 days.
You can change these default values on the Rules page in the TrueSight Capacity Optimization console.
For more information about modifying the Optimizer rules, see Adding a template-based Optimizer rule.The minimum 5 days of data is required to calculate the utilization trend of resources. You can modify this setting on the Thresholds page in the TrueSight Capacity Optimization console.
The following table explains some example scenarios for vSphere clusters when the resource usage can increase and suggested actions to reduce the usage.
|Scenario for the increase in the resource usage trend||Suggested actions|
|Hosts in the vSphere cluster are disconnected or are in the maintenance mode||Troubleshoot the hosts and recover cluster resources.|
|A cluster has the High Availability (HA) option turned ON.|
Troubleshoot the hosts to recover the resources of the cluster and eliminate the future saturation condition.
Remove the condition that prevents an available host from powering on to add resources to the cluster. The condition can occur due to any of these reasons:
|Storage is saturating soon or is already saturated.|
|CPU or memory is saturating soon or is already saturated.||If the cluster contains idle VMs, remove them to reclaim the CPU or memory resources.|
|A workload (application) running inside a VM is causing high usage.||Troubleshoot (for example, stop runaway processes) or tune the application to reduce its footprint, and then reduce the reservations or limits available to the VM or its parent resource pools to improve the cluster efficiency.|