Using The History Queue; History Queue - HP E8402A User And Service Manual

Using the History Queue

HISTory Queue

Chapter 2
The HP E840x Enhanced Monitor provides many history feature records
such as: minimum and maximum values, histograms, operating times, and
event logs. As you begin to use the mainframe, the history features won't be
of much use -- very little has happened, there is no history to record. But as
time passes, the history features can provide valuable insights into the trends
of your test system. Then, when you encounter a problem in your tests
system, you have a record of events to evaluate:
-- What type of environment has the module experienced?
-- What events led up to the failure?
-- What changes from one test system to another?
Over time, familiarity with the problems of one particular test system may
lead to predictive knowledge about the system. Then, by watching those
predictive events using the history feature, you can prevent problems.
One of the history features is history queue – a list of events that occurred in
the mainframe. History events are recorded with the operating time that the
event took place (the operating time is the number of seconds since the
mainframe was manufactured). The history queue is available through the
display; operating time is displayed in hours. Operating Events are shown
with the most recent displayed first, earliest events displayed last. Figure 2-4
shows an example history display.
To access the history queue, select
display or execute the command:
arrow keys to page up and down the list (Up/Down arrows appear in the
display only when additional data is available) four events at a time.
Figure 2-4. Example History Queue Display
History from the Mainframe Status
. Use the Up/Down
DISP:WIND HQU
Down arrow indicates
more data is available.
Use Up/Down keys to
scroll through display.
Using the Enhanced Monitor 39