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Knowledge Base

Resource Distribution chart on Cluster Summary tab only shows some hosts (1007070)

Last Updated: 9/19/2008Categories: Total Views: 7313Language:
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Symptoms

The VMware DRS Resource Distribution chart for a HA/DRS cluster shows less hosts than are in the cluster.

The VMware DRS Resource Distribution chart (on the Summary tab) is incorrect.

Purpose

This article provides information about the VMware DRS Resource Distribution chart.

Resolution

The VMware DRS Resource Distribution chart provides a quick visual snapshot of the performance of a cluster. The chart is a histogram and is often misinterpreted.

The host Utilization graph (the top graph in the VMware DRS Resource Distribution section) is a histogram that shows the number of hosts on the X axis and the utilization percentage on the Y axis. If the cluster is unbalanced, you see multiple bars, corresponding to different utilization levels. The blue bars represent CPU usage and the orange bars represent memory usage.

For example, in the image below, two hosts are at 0–10 CPU utilization and the third at 80–90 percent CPU utilization. Each is represented by a blue bar. In this cluster, DRS is in manual mode (moderate aggressiveness) and is making a recommendation. After the recommendation is applied the blue bars become closer to each other on the Y axis. The closer the blue and orange bars are to each other, the more balanced the cluster is.

The Entitled Resources Delivered graph (the bottom graph in the VMware DRS Resource Distribution section) is a histogram that shows the number of hosts on the Y axis and the percentage of entitled resources delivered for each host on the X axis. The top graph reports raw resource utilization values. The bottom graph incorporates additional information about resource settings for virtual machines and resource pools. DRS computes a resource entitlement for each virtual machine, based on virtual machine and resource pool configured shares, reservations, and limits settings, as well as the current demands of the virtual machines and resource pools.

What the virtual machine demands is not necessarily what it deserves or is entitled to because of the virtual machine and resource pool configurations. After computing the entitlements, DRS computes a resource entitlement for each host by adding the resource entitlements for all virtual machines running on that host. The percentage of entitled resources delivered is equal to the host’s capacity divided by the entitlements of the virtual machines. This means that in a cluster in which all the entitled resources are delivered, the graph has a single bar for each resource in the 90–100 percent histogram range. The image shows that even though the DRS cluster is not balanced, each of the virtual machines got the resources to which it was entitled.

Related Information

For more information, see DRS Performance and Best Practices.

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