Gather Performance Metrics
It is often the case that an ISA server, when first deployed, can easily handle the traffic
that it processes, but then slowly become more and more overloaded over time. This can
be true particularly for servers that start their lives with limited roles, such as a reverseproxy
server only, but then over time take on additional roles such as VPN server, contentcaching
server, or edge firewall. It is therefore important to monitor the performance of an
ISA server on a quarterly basis, using a utility such as the Performance Monitor (perfmon),
shown in Figure 17.7.
If regular monitoring of the ISA server indicates that the system is getting overloaded, it
can be retrofitted with additional memory, more processors, faster disks, or multiple
servers that are added into the environment.
Reassess Goals and Objectives
As is often the case with IT solutions, a project??™s goals and objectives may change over
time. ISA may have been deployed for a limited role??”for example, to satisfy a certain
need. Later on, however, other functionality that ISA can provide may become necessary.
It can be quite advantageous to reevaluate goals and objectives on a quarterly basis to see
whether any of the additional functionality that ISA provides can satisfy them.
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