
Section 16 Virtual Client Thin Clients
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summated to have a starting minimum physical resource definition. Expansion
through redefining the virtual nodes with more resources, of adding additional
virtual nodes should also be added into the minimum definition.
Table 10 shows an example of defining server hardware based on the number of
users on virtual terminal servers.
When a larger number of users are involved, it is recommended to have multiple
virtual terminal servers. When a virtual node has more virtual CPUs allocated to
handle the load, the process of providing physical CPU resources may have a
performance impact. To determine level of runtime loading of the virtual terminal
server, the task manager in the virtual terminal server is called up, and checked to
see if any process is consuming a full logical processor in CPU loading. Note that
for example, if a virtual terminal server has 4 virtual CPUs, a process that has 25%
CPU loading if fully loading one physical logical processor.
Thin Clients
These are small computers that normally have an embedded version of Windows 7
pre-installed by the manufacture of the thin client.
One or more monitors, keyboard, mouse and networking are connected to the thin
client. Thin client establishes communication with the virtual client using client
Table 10. VMware ESXi Server Dimensioning Example
No of
Concurrent
Users
No of
Virtual
Terminal
Servers
Minimum Server Hardware Requirements
No of CPUs
(with HT)
No of Logical
CPUs
RAM
Total
Hard Disk
6 1 1 x QUAD CORE 1x4x2 => 8 16 GB 130 GB
8 2 1 x SIX CORE 1x6x2 => 12 24 GB 240 GB
12 2 2 x QUAD CORE 2x4x2 => 16 24 GB 260 GB
16 3 2 x SIX CORE 2x6x2 => 24 64 GB 360 GB
If a virtual terminal server is restarted due to installation of Microsoft patches, a
higher number of users of the terminal server results in more disruption.
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