The capacity buffer element lets you add buffer for capacity and cost calculation. For vCenter Server objects, you can add buffer to CPU, Memory, and Disk Space for the Demand and Allocation models. You can add capacity buffer to clusters and datastore clusters. The values that you define here affect the cluster cost calculation. The time remaining, capacity remaining, and recommended values are calculated based on the buffer. For WLP, capacity buffer is first considered and then the headroom that you have defined is considered.

Where You Define the Capacity Buffer

To view and override the policy Capacity Buffer analysis setting, in the menu, click Administration, and then in the left pane click Policies. Click Add to add a policy or select the required policy, and then in the right pane, click Edit Policy to edit a policy. In the Create or Edit policy workspace, click Capacity, then select one or more objects in the left pane. The custom profile element for the object types that you selected in the workspace appear in the right pane. Click the lock icon to unlock the section and make changes.

How the Capacity Buffer Element Works

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. The value of the usable capacity reduces by the buffer amount that you specify here. The default buffer value is zero. If you are upgrading from a previous version of vRealize Operations Cloud, the buffer values are carried forward to the new version.

The capacity buffer value that you specify for the Allocation model is considered only if you have enabled allocation model in the policy.

The following tables display the capacity buffer that you can define based on the vCenter Adapter object types:
Object Type Valid Models for Capacity Buffer
CPU Demand


Memory Demand


Disk Space Demand