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MetaFrame supports multiple users on a Windows Terminal Server. A multiuser system requires more system resources than a single-user system. This section contains some system sizing guidelines that can help you decide on a hardware configuration that will support your users with optimal performance.

Most companies find that their users can be placed in one of two categories: typical users and power users. A typical user generally uses one or two applications but normally only one at any given time. Little actual program data is transferred between the client and server, and the users rarely use Object Linking and Embedding (OLE). A power user is a more sophisticated user who uses three or more applications, often with several active at the same time. Data is often cut- and-pasted between local and remote applications, and OLE is used heavily.

Obviously, power users consume more resources than typical users; this must be factored in when configuring MetaFrame servers. A good rule of thumb is that one power user is equivalent to two typical users in processor utilization and memory requirements. All the configuration examples in this section are based on numbers of typical users; adjust them according to the number of power users anticipated.

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The processor and bus architecture are fundamental to MetaFrame server performance. The ISA (AT bus) architecture is low-bandwidth and is not recommended for MetaFrame servers. Use a higher-performance bus, such as EISA or PCI for best performance. All of these buses support the high sustained data transfer rates typical of a MetaFrame server.

The memory requirements for MetaFrame and Windows Terminal Server are 16MB of RAM, plus 4MB for each typical user or 8MB for each power user. In many cases, adding RAM has a larger effect on system performance than upgrading to a faster processor.

It is important to note that the processor and memory requirements for MetaFrame scale linearly. This means you can roughly double the number of users supported on a multiprocessor-capable system by doubling the number of processors and doubling the amount of RAM memory. For this reason, purchase a multiprocessor-capable system, even if you initially purchase only one processor, to allow for convenient system scaling as your requirements grow. Note that not all multiprocessor systems scale the same way because of bus differences. The bus architecture in a multiprocessor system is crucial for multiprocessor performance with more than four processors, and vendor-specific drivers are usually required.