Viewing cluster headroom

Cluster headroom shows you how much extra capacity your clusters have to host workloads. When you set the scope to a cluster, the Home Page then includes charts that show headroom for that cluster, as well as time to exhaustion of the cluster resources.

To view host cluster headroom:

1. Navigate to the Search page.

2. Choose the Host Clusters category.

3. Select the cluster you want to view.

4. When the Home Page displays, scroll down to show the headroom charts.

   Make sure you have selected the Host tier in the supply chain navigator.

To calculate cluster capacity and headroom, Turbonomic runs nightly plans that take into account the conditions in your current environment. The plans identify the optimal workload distribution for your clusters. This can include moving your current VMs to other hosts within the given cluster, if such moves would result in a more desirable workload distribution. The result of the plan is a calculation of how many more VMs the cluster can support.

To calculate VM headroom, the plan simulates adding VMs to your cluster. The plan assumes a certain capacity for these VMs, based on a specific VM template. For this reason, the count of VMs given for the headroom is an approximation based on that VM template.

To specify the templates these plans use, you can configure the nightly plans for each cluster. For more information, see Configuring Nightly Plans