Red Hat ENTERPRISE VIRTUALIZATION FOR DESKTOPS Manual de usuario descargar pdf (Pagina 6)

A Principled Technologies sizing guide 6

Red Hat Enterprise Virtualization sizing guide

INVESTIGATING THE NUMBERS

We ran 110 desktops in our office user testing and 80 desktops in our power

user testing. While we did not reach the unacceptably high response time, we did

closely approach it. The charts below are from our maximum guest runs, showing the

ramp-up in Login VSI from 0 guests running the benchmark to all guests running it. The

number of guests running is based off of the delay between guest starts, allowing us to

calculate the number of guests running at that time. The per-guest calculations we

present in this section are based on dividing the maximum utilization shown in the

charts by the number of guests we ran.

Processor requirements

The amount of processing power your server delivers has a direct bearing on the

number of guests it can support. As Figure 4 shows, CPU utilization steadily rises as the

maximum number of desktops approaches. CPU utilization is a somewhat nebulous stat

to calculate, but based on the Login VSI data, a good rule of thumb is that you can fit

about 9.6 guests per physical core in your computer.

Figure 4: CPU utilization in the office worker scenario.

Similar to the office worker, CPU utilization increases as each power user logs in.

Based on the Login VSI data, a good rule of thumb for the power user is to allocate

approximately 7.0 guests per physical core. (See Figure 5.)

100

0 10 20 30 40 50 60 70 80 90 100 110

CPU %

Number of guests running

CPU utilization - Office worker

1 2 3 4 5 6 7 8 9 10 11 ... 27 28

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Red Hat ENTERPRISE VIRTUALIZATION FOR DESKTOPS Manual de usuario Pagina 6