The Inside View of Desktops Layer

The Outside View of VMs layer provides an “external” view of the different VM guests - the metrics reported at this layer are based on what the VMware host is seeing about the performance of the individual guests. However, an external view of the VM guest operating system and its applications may not be sufficient. For instance, suppose one of the disk partitions of the guest operating system has reached capacity. This information cannot be gleaned from host operating system. Likewise, bottlenecks such as a longer process run queue or a higher disk queue length are more visible using an internal monitor. Internal monitoring (from within the guest operating system) also provides details about the resource utilization of different application(s) or processes.

The tests mapped to the Virtual Desktop layer provide an “internal” view of the workings of each of the guests - these tests send probes into each of the guest operating systems to analyze how well each guest utilizes the resources that are allocated to it, and how well it handles user sessions, TCP traffic, and network loading.

By default however, clicking on the Virtual Desktop layer, does not list the associated tests. Instead, Figure 1 appears, which displays the current state of all virtual desktops that have been configured on the monitored ESX host.

Figure 1 : The current state of the desktops configured on the ESX VDI (i) server host that is monitored

To return to the layer model of the VMware VDI server and view the tests mapped to the Virtual Desktop layer, click on the component layers link in Figure 1. The tests depicted by Figure 2 then appears.

Figure 2 : The tests associated with the Virtual Desktop layer of a VMware vSphere VDI

Almost all the tests depicted by Figure 2 have already been dealt with in the section on the vSphere ESX server model. The two tests that are specific to the vSphere VDI Server model are the Terminal to Desktop Connection test and the Desktop ICA Channel Test.