Red Hat ENTERPRISE VIRTUALIZATION FOR DESKTOPS Manual de usuario descargar pdf (Pagina 12)

A Principled Technologies sizing guide 12

Red Hat Enterprise Virtualization sizing guide

APPENDIX A – HOW LOGIN VSI WORKS

After all desktops are idle, Login VSI incrementally logs users into virtual desktop

sessions and begins workloads on each. Login VSI measures the total response times of seven

typical office operations from each session and calculates the VSI Index by taking the average

response times and dropping the highest and lowest 2 percent. The average response time of

the first 15 sessions determines a baseline; the Dynamic VSImax is baseline x 125% +3000ms.

The Login VSI response time is not latency; it is the total time to execute 7 operations

that occur during the 15 minute workload. The seven operations are as follows:

 Copying a new document from the document pool in the home drive

 Starting Microsoft Word

 Starting the File Open dialogue

 Starting the Search and Replace dialogue

 Starting the Print dialogue

 Starting Notepad

 Compressing the document into a ZIP file with 7-zip command line

As more sessions begin to consume system resources, response times degrade and the

VSI index increases until it is above the Dynamic VSImax. When this condition is met, the

benchmark records a Login VSImax, which is the maximum number of sessions that the platform

can support.

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Red Hat ENTERPRISE VIRTUALIZATION FOR DESKTOPS Manual de usuario Pagina 12