That said, all these factors should be taken into account when designing an ISA
server implementation.
204 CHAPTER 8 Deploying ISA Server 2006 as a Content Caching Server
NOTE
ISA Server licensing operates on a per-processor basis. Subsequently, a dual-CPU server
costs twice as much to license as a single-CPU system. Because adding processors
produces diminishing returns from a performance perspective (doubling the number of
CPUs increases performance by only 50% in most cases), it is most cost effective to
deploy single-CPU ISA servers where possible. In larger environments, it makes sense
to add CPUs when performance dictates it, but it is important to keep in mind the
licensing issue when scoping possible ISA configurations.
ISA Server 2006 by itself does not require much in the realm of disk space. Enabling
content caching on an ISA server, on the other hand, requires a large amount of disk space
to be made available to the server in the form of the ISA cache file. This file can be predefined
as a certain size, and it is important to allow as much space as will be required by
the server to store the cache images and text.
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