Installation guide

Chapter 2. xSeries thin-client servers 13
Addressing Extensions (PAE) or Address Windowing Extensions (AWE). Even with PAE
enabled, the underlying architecture of the system is still based on 32-bit linear addresses.
The solution is to use the Windows Server 2003 64-bit edition, which allows large servers to
effectively scale to many processes and terabytes of RAM. This requires 64-bit versions of
today’s 32-bit client applications to run natively in 64-bit mode. However, 32-bit applications
can run using an emulation layer, much like Windows Server 2003 can run 16-bit applications
today but with the associated emulation overhead.
2.5 Which servers to use
Table 2-1 offers a guide for choosing an appropriate xSeries model for your Citrix MetaFrame
farm.
Table 2-1 xSeries guide for a Citrix MetaFrame environment
Rack optimized x335 servers can be used for all environments from several MetaFrame
servers through enterprise environments that consist of server farms located across multiple
locations. For larger Citrix farms, IBM BladeCenter may be more cost effective and use less
rack space. It’s worthwhile to consider the number of MetaFrame servers you need today as
well as the number that you may purchase in the years to come.
For large and enterprise Citrix environments, the x440 using VMware may be another way to
consolidate the number of MetaFrame servers while providing the same level of performance
of smaller dual processor servers in a scale-out design.
Citrix farm size Description xSeries model guide
Small One to two MetaFrame servers supporting less than 100
users
x335
Medium Server farm of two to 10 MetaFrame servers x335
BladeCenter
Large Less than 50 servers x335
BladeCenter
x440 and VMware
Enterprise Greater than 50 MetaFrame servers x335
BladeCenter
x440 and VMware