CPU and memory utilization of applications vary
depending both on the application and the functionality being used, so there??™s no real rule
of thumb to define how many users can simultaneously use your server without severely
Figure 9-37. TS Web Access as a regular user
330 Microsoft Windows Server 2008 Administration
degrading performance and usability. You will need to compare your benchmark data
with data you retrieve once users start accessing TS-hosted applications to get more accurate
metrics for your applications. Your goal should be a reasonable estimate per user,
per application, in terms of CPU and memory use. This will let you easily estimate how
many users can co-exist on one server of particular server specifications. This, however, is
much easier said than done, since many applications use resources differently depending
on what function they??™re performing. If you trend your data long enough, though, you
should be able to come up with reasonable numbers. Work your servers to about 75 to 80
percent utilization and stop there. Any fluctuations in resources required by your clients
can be handled by the server.
CHAPTER SUMMARY
Out of the box, Terminal Services is a useful and feature-rich product. Upgrades to the
security capabilities of Terminal Services, such as network level authentication, give you
the option of increasing your security while still providing a user-friendly experience.
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