The CPU (MHz) chart displays CPU usage for the cluster.
This chart is located in the Home view of the Cluster Performance tab.
Sum of the average CPU usage values, in Megahertz, of all virtual machines in the cluster.
Total amount of CPU resources available in the cluster. The maximum value is equal to the number of cores multiplied by the frequency of the processors.
For example, a cluster has two hosts, each of which has four CPUs that are 3 GHz each, and one virtual machine that has two virtual CPUs.
VM totalmhz = 2 vCPUs * 3000 MHz = 6000 MHz
Host totalmhz = 4 CPUs * 3000 MHz = 12000 MHz
Cluster totalmhz = 2 x 4 * 3000 MHz = 24000 MHz
A short spike in CPU usage indicates that you are making the best use of cluster resources. However, if the value is constantly high, the CPU demanded is likely greater than the CPU capacity available. A high CPU usage value can lead to increased ready time and processor queuing of the virtual machines on the hosts in the cluster.
If performance is impacted, consider taking the following actions.
|1||Verify that VMware Tools is installed on each virtual machine.|
|2||If the cluster is not a DRS cluster, enable DRS. To enable DRS, perform the following tasks:
If the cluster is a DRS cluster:
|4||Migrate one or more virtual machines to a new host.|
|5||Upgrade the physical CPUs or cores on each host in the cluster if necessary.|
|6||Enable CPU-saving features, such as TCP Segmentation Offload.|
|7||Replace software I/O with the dedicated hardware, such as iSCSI HBAs or TCP Segmentation Offload NICs.|