88 IBM Enterprise Workload Manager
4.2.1 Classifying your workload
To help with understanding the process of classifying work, think of it as a series of funnels
that increasingly categorize the work each step of the way to the desired goal within EWLM.
Figure 4-6 depicts this concept. EWLM, of course, rather than using funnels, uses filters to do
the classification. As a result of the classification, the work is assigned to a service class. It is
through this mechanism that EWLM can monitor the actual achievement with respect to
desired performance goals.
Figure 4-6 Classification of workload
The key to classification is to configure the filtering well enough to get all workflow through the
funnels at the lower level as shown in Figure 4-6. This involves defining the filters at a
granular enough level within both the transaction classes and process classes. The narrower
the funnel, the more classified the work has been made. How narrow the funnel is (or how
granular the level of filtering), depends on the requirements of your installation. Likewise, the
performance goals that are defined within the service classes should be directly related to the
business needs or goals of your installation.
The funnel in the lower center tied to the default service class represents workload that goes
unclassified. This is usually by accident and occurs when new workload enters the domain
without being defined to EWLM, or the workload was never defined in any of the transaction
or process classes originally. We recommend that you avoid this circumstance by defining
within the service policy two default service classes: one for unclassified transactions and one
for unclassified processes. Define each of these service classes with a name like
unknown,
unclassified, or network. Usually these service classes should not have workload assigned;
so, if you notice that work has been reported within them, it means that more classification is
needed. Performance goals in both of these default service classes should be set to
discretionary.
Service
Class A
Service
class B
Default
Service
Class
Service
Class C
Service
Class 3
Service
Class 2
Service
Class 1
Unclassified Workload
Transactional (Application Filters)
Process (Platform Filters)
Process Class Filters
Transaction Class Filters
Service Classes
with varying Velocity
Performance Goals
Service Classes with
varying Response Time
Performance Goals
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