The Capacity tab provides Time Remaining and Capacity Remaining data for the selected object. Virtual Machine Remaining data is available for Clusters, Datacenters, CDC, and VC based on the average profile, or when you enable one or more custom profiles in the policy.
Where You Find the Capacity Tab
- In the menu, click Environment, then select a group, custom data center, application, or inventory object. The Object details screen appears. Click the Capacity tab.
- In the menu, select Alerts to display the All Alerts screen. Click an alert to show the alert details on the right, then click View Additional Metrics to see more information about the alert and the object that triggered the alert. Click the Capacity tab.
Understanding the Capacity Tab
For the selected object, the Capacity tab lists two panes with the Time Remaining and Capacity information. These panes display the value of the resources remaining till they run out.
Below the Time Remaining and Capacity panes, the time and capacity utilization metric for CPU, memory, and disk space are displayed in three panes. By default, the most constrained resource is selected. Click CPU, Memory, or Disk Space to change the views to these resources. These panes display the resource information based on the Demand model (default) or Allocation model (if configured).
- Time Remaining Pane
When you select the Time Remaining pane and click one of the resource types, the utilization graph displays the historical value of the utilization metric and its forecast plotted against time, projecting how swiftly resource utilization is approaching the usable capacity.
- Capacity Pane
The Capacity Remaining pane indicates the unused capacity of your virtual environment to accommodate new virtual machines. vRealize Operations Manager calculates the Capacity Remaining as a percentage of the remaining capacity, compared to the total. Capacity Remaining is calculated as the utilization metric forecast 3 days from now subtracted from the Usable Capacity. vRealize Operations Manager calculates the average profile and always computes the virtual machine remaining number based on the average profile. You can change the profile by clicking the + icon above the bar chart. vRealize Operations Manager calculates virtual machine remaining numbers when you enable one or more custom profiles from the policy. The overall virtual machine remaining is based on the most constrained profile.
When you select Capacity and click one of the resource types, a bar chart and a table of values based on the Demand and Allocation model (if configured) appears. The bar chart displays total usable resource, the percentage used, the percentage allocated for high availability and buffer, and the percentage remaining based on the Demand and Allocation models (if configured).The table displays the following information for each resource type:
- Total: The total usable capacity for each resource type based on the Demand model or Allocation model (if configured). The difference in Total capacity and Usable capacity is set in the HA (admission control) that is set in the clusters in vSphere.
- Usable: The total usable capacity for each resource type based on the Demand model or Allocation model (if configured).
- Used: Approximate value how much utilization do you have now. Shows the forecast value of utilization metric in 3 days from now. If Capacity Remaining is greater than zero, then Used = Usable - Capacity Remaining.
- Recommended Size:The Total Capacity that must be available for a green level of Time Remaining. The slider in the policy controls the Time Remaining green zone, and the default value is 150 days.
- Remaining: The Capacity Remaining metric value and also the percentage. The value of Capacity Remaining metric is calculated by forecasting the utilization metric 3 days from now and subtracting it from Usable capacity.
- Buffer: The percentage of the capacity buffer based on the buffer value that you set in the policy. The Capacity Buffer element determines how much extra headroom you have and ensures that you have extra space for growth inside the cluster when required.
- High Availbility: The percentage of the high avaibility based on the high availability buffer.
The Capacity tab is a subset of the Capacity optimization capability. For additional details, refer to Capacity Overview.