Red Hat ENTERPRISE VIRTUALIZATION FOR DESKTOPS Uživatelský manuál stáhnout pdf (Strana 4)

A Principled Technologies sizing guide 4

Red Hat Enterprise Virtualization sizing guide

Based on our testing, we developed the sizing guidelines in Figure 1.

Office worker

Power user

Number of guests per physical core

9.6

7.0

RAM (GB) per guest

1.88

2.54

Disk activity (IOPS) per guest

8.6

10.7

Network traffic in Megabits per

second per guest

1.5

1.3

Figure 1. Sizing requirements for two types of users.

USING LOGIN VSI TO LEARN ABOUT A SERVER’S CAPACITY

To determine our server’s virtual desktop capacity, we used the Login

Consultants Virtual Session Indexer 3.5 Release 1 benchmark. Login VSI consists of

several workloads that perform a range of tasks to simulate different kinds of users. The

results show the maximum number of virtual desktops a server can support for a

maximum response time on a particular set of tasks. (For more detailed discussion of

how Login VSI works, see Appendix A.) In addition to the performance scores from the

CPU utilization, memory usage, and disk activity.

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

sessions and begins workloads on each. Login VSI measures the aggregate time it takes

to complete seven typical office operations from each session, and reports it as

“response time”. As the number of guests running increases, response time also

increases. After a certain point, a long response translates to unacceptably slow

performance for end users.

Figure 2 shows the average Login VSI response time for all active sessions we

recorded during our office worker test. We ran 110 users and the server was able to

support this load without reaching what Login VSI considers an unacceptable response

time. Figure 2 also shows the approximate user counts where the processor utilization

was at 40% and 80%. Generally, 40% utilization is very comfortable, but once a server

hits 80%, it is getting close to saturation and leaves little room for growth or changing

user needs.

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