VMware VSPHERE CLIENT 4.0 - UPGRADE GUIDE UPDATE 1 Manual do Utilizador descarregar pdf (Página 147)

Section 16 Virtual Client Terminal Server Definition

3BSE056141-510 F 147

performing. For example, a user that logs on and looks at few of the documents will

produce lower loading than a user that logs on from a 4 screen thin client, calls up a

4 screen 800xA workplace and a quantity of alarms and trend displays.

Loading of a computer is typically in the form of CPU, RAM and disk usage. As

with most graphical interfaces, the 800xA workplace presentation is supported by

one of the threads in the application. When the quantity of display objects is

increased, the loading to display the objects is increased. If the loading becomes too

high, the thread will reach the full capacity of a single physical logical processor,

and the workplace response to user interaction will become slower. This provides a

measure of overloading the virtual terminal server session. To minimize the impact

on other users, there should be one virtual CPU per terminal server session and one

physical logical processor per virtual CPU. As with all computers, there are many

other processes in the background which require CPU access. Hence, along with the

virtual CPUs that have been specified for the terminal server sessions, at least one

additional virtual CPU should be added for background tasks.

Considering that the physical CPU is ultimately responsible for rendering graphics,

a faster physical CPU provides better capability than a slower one.

When considering RAM, the virtual terminal server operating system needs 2GB of

RAM, and each concurrent terminal server session should have 1- 2GB of RAM.

For the hard disk, additional hard disk capacity should be added to cater for user

local storage requirements.

In some cases, the virtual terminal servers will be in a virtual host with other 800xA

nodes. The requirements for all virtual nodes should be summated to establish the

total physical requirements for the physical server.

Terminal Server Definition

Considering that there are many varying factors involved in the usage of a terminal

server, an initial recommendation should be considered, a guidance which should be

updated based on experience. Some installations may have sparsely populated

800xA graphic displays, whilst others are more heavily populated across more

monitors. Providing additional capacity in the form of virtual and physical resources

If there are more virtual CPUs than physical logical processors, there may be a

performance impact depending on the overall loading of the physical server as

the virtual machines may have to wait to access physical logical cores.

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VMware VSPHERE CLIENT 4.0 - UPGRADE GUIDE UPDATE 1 Manual do Utilizador Página 147