Availability Guide for Problem Management

Monitoring Event Messages
Availability Guide for Problem Management–125509
4-13
Step 1—Instrumenting Applications to Generate
EMS Event Messages
enhancements to these standard events. The names of these events indicate the
conditions being reported, as follows:
•
Object Available
•
Object Other State Change
•
Object Unavailable
•
Operator Attention Completed
•
Operator Attention Needed
•
Transient Fault
•
Usage Threshold
Table 4-2 lists the management functions and the type of events designed to support
them.
Tandem provides two products to help you standardize your application event messages:
•
NonStop Virtual Hometerm Subsystem (VHS) allows you to manage application
event message conversion to EMS format.
•
EMS/FastStart allows you to develop and test EMS event messages.
Using NonStop VHS to Convert Messages to EMS Format
NonStop VHS allows you to convert existing applications to EMS format without
having to modify any application code. To an application, NonStop VHS acts as a
physical terminal. Whenever it receives a DISPLAY message, it converts the message
into an EMS event.
Since the distinction between critical, action, and informational event messages, as
defined by EMS, may not be used by some applications, you must analyze your current
application messages and differentiate between the critical and action messages. As a
result of this analysis, you can develop an EMS filter that searches text messages for
words such as ERROR, ABENDING, ABORT, and EXCEPTION, and highlight these
messages.
Table 4-2. Management Functions and Their Supporting Standard Event Types
Management Function or Operation Supporting Standard Event Type
Object state monitoring Object Unavailable
Object Available
Object Other State Change
Reactive problem management Object Unavailable
Proactive problem management Usage threshold
Transient fault
Production requests requiring operator attention Operator Attention Needed
Operator Attention Completed
Note. Text search can cause an increase in overhead.