The Capacity Overview Dashboard provides you with a summary of the total physical capacity available across all your environments being monitored by vRealize Operations Manager. The dashboard provides a summary of CPU, memory, and storage capacity provisioned along with the resource reclamation opportunities available in those environments.
Since capacity decisions are mostly tied to logical resource groups, the Capacity Overview dashboard allow you to assess capacity and utilization at each resource group level such as vCenter, datacenter, custom datacenter, or vSphere cluster. You can quickly select an object and view the total capacity and used capacity of the object to understand the current capacity situation. Capacity planning requires that you have visibility into the historical trends and future forecasts. The trend views within the dashboard provide you with this information to predict how soon you will run out of capacity.
If you plan to report the current capacity situation to others within your organization, you can edit the Cluster Capacity Details widget on this dashboard and export this as a report for sharing purposes.
You can use the dashboard widgets in several ways.
Total Environment Capacity: Use this widget to view the total available capacity in the environment including information about the number of hosts and datastores. You can also view storage, memory, and CPU capacity, and the number of physical CPUs.
Select an Environment: Use this widget to select a data center, a cluster compute resource, or a vCenter Server. You can use the filter to narrow your list based on several parameters. After you identify the data center you want to view, select it. The dashboard is populated with the relevant data.
Total Reclamation Opportunity: Use this widget to view the reclaimable resources in the environment.
Total Capacity: Use this widget to view the total physical capacity of the environment that includes capacity assigned as High Availability (HA). The actual capacity is less than the total capacity displayed when you consider HA and a buffer.
Used Capacity: Use this widget to view the capacity that has been used in your environment.
Memory Capacity Utilization Trend (TB): Use this widget to view the overall memory capacity trend. This widget displays the total physical resources you have. The physical resources include a HA buffer and a utilization buffer. This widget also displays the total memory you have allocated to VMs. If the number is close to the total physical capacity, the VMs may contend for memory. Ensure that the contention level is lower than what you promise to your customers. The chart also includes the actual utilization of memory capacity. The actual utilization is based on the active memory and hence it tends to be lower, as VMs do not normally access most of their RAM at any given moment.
CPU Capacity Utilization Trend (GHz): Use this widget to view the overall CPU capacity trend. This widget displays the total physical resources you have. The physical resources include a HA buffer and a utilization buffer, which reflects the total capacity. This widget also displays the total CPU capacity you have allocated to VMs. If the number is close to the total physical capacity, the VMs may contend for CPU. Ensure that the contention level is lower than what you promise to your customers. The chart also includes the actual utilization of CPU. The actual utilization is based on the CPU demand counter, which takes into account the CPU used to perform I/O on behalf of the VM. The ESXi host performs storage I/O and network I/O on behalf of the VM, and this may be performed on a core that is different from the one on which the VM runs. As a result, CPU demand is a more accurate reflection of the VM CPU usage.
Disk Space Capacity Utilization Trend: Use this widget to view the amount of disk space allocated to a VM and the amount that is actually used. This information is helpful when you plan for thin provisioning.
Cluster Capacity Details: Use this widget to view the capacity of each cluster in the environment. You can view details such as the number of VMs, hosts, datastores, and CPUs in each cluster. You can also view details such as the total CPU capacity and the provisioned CPU capacity, the total memory, and the provisioned memory in each cluster.