In this section, we discuss the performance during the desktop deployment phase of the 600 instant-clone desktops.
For instant-clones as for full-clones, in the first phase of the desktop deployment, VMware Horizon creates a single replica of the ‘golden-master’ operating system (OS) image, and then clones this replica for each new desktop. Once cloned, each desktop performs customization steps. This process is repeated for all the desktops generated in the test. When all the desktops are provisioned, LoginVSI restarts all of them, creating a ‘boot-storm’.
Because more resources are shared when using instant clones, each desktop server could accommodate more desktops, as compared to the full-clone test. The eight Dell PowerEdge 740 servers with 128 GB RAM were able to accommodate 45 instant-clone desktops each, and the Dell PowerEdge 740 servers with 256 GB RAM were able to accommodate 60 instant-clone desktops each without affecting CPU or memory utilization.
Instant-clone provisioning and OS customization of all 600 desktops finished in about 45 minutes. The maximum IOPs measured during that phase was 72,193 IOPs with write and read response times at 0.72ms and 0.17ms respectively, as shown in Figure 9.
The average CPU utilization of the four PowerEdge R740 servers (256 GB memory) and of the eight PowerEdge R740 servers (128 GB memory) was about 80%. The average memory utilization was about 70% for the PowerEdge R740 server (256 GB) and 95% for the PowerEdge R740 server (128 GB).
In this section we describe the performance during the desktop workload phase of the 600 instant-clone desktops.
As with the full-clone tests, instant-clone testing never reached the VSImax threshold of 1675. Our VSImax average was only 835, indicating that the PowerMax storage system could have sustained more than twice the tested workload, if more ESXi servers had been added.
More details about the LoginVSI test methodology can be found here: Analyzing LoginVSI Results.
Figure 11 shows the LoginVSI test results summary. The baseline performance score was 675 for the knowledge worker test run, which as shown at the bottom of the image, is considered by LoginVSI to be very good performance.
Figure 11. LoginVSI instant-clone test results summary
Figure 12 shows the maximum IOPS and response times achieved during the Knowledge Worker test run. The results included a read response time of 0.15 ms and write response time of 0.40 ms, which indicates a superior desktop-user experience. The test ran for approximately 60 minutes.