EMS Manual

Configuring EMS
EMS Manual—426909-005
12-2
Primary Collectors
Primary Collectors
Each system must have one, and only one, primary collector process, named $0. The
primary collector process is configured during system generation and is started when
the system is loaded. It always runs as a process pair. At any time, you can switch the
primary and backup processes of the primary collector’s pair.
The primary collector can respond to a maximum of 127 concurrent #ZSPI opens and
unlimited event sources. Any of these requesters can issue these opens:

A distributor accessing the current collector log, as opposed to a specific log file

A compatibility distributor

An EMS utility program that accesses the collector (EMSCCTRL or EMSCINFO)

A management application using the collector’s command-response interface
Alternate Collectors
An alternate collector is similar to a primary collector in the way it handles basic
functions such as event-message and log-file management. The difference is that an
alternate collector must be explicitly started and stopped.
Alternate collectors have these basic characteristics:

You can start as many alternate collectors on your system as the requirements of
your system dictate.
Figure 12-1. Relationship Between EMS Components
Log
Files
Forwarding
Distributor
Printing
Distributor
Compatibility
Distributor
($Z0)
Log
Files
Consumer
Distributor
Primary
Collector ($0)
Alternate
Collectors
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