Displaying real-time and historical data in views and easy menus

Two sets of views are available; one set for monitoring and managing Linux and z/VM systems in real-time (Time Frame - Real-time) and another set for viewing Linux and z/VM system historical data (Time Frame - Interval) for trend analysis. Real-time views are invoked by default when the product is initially accessed. Interval views (for viewing historical data) can be invoked either from the EZLENV easy menu or by typing EZLNXI at the COMMAND line.

Most of the real-time view names end with the letter R. The exceptions to this naming convention are the following views:

• PSLTREE
• FSLSPACE
• EZLENV
• EZLNX

PSLTREE and FSLSPACE are real-time-only views. EZLENV easy menu is an example of a view that pertains to neither real-time nor interval time frames; therefore, it has no special name suffix. EZLNX is a real-time easy menu, which has an alias of EZLNXR.

The following types of interval views exist:

• summary interval views
•  interval views

As you navigate through the interval time frame easy menus, the hyperlinks take you to summarized views. Summarized view names end with the letter Z. If you use the TIME command to select multiple intervals, the data is summarized and the numerical values in one row represents an average of those fields for all the intervals that were specified by the TIME command.

If you hyperlink on the key field of one of the summarized rows, you will be taken to an interval view, which expands the summarized row and displays one row for each selected interval. This view has the same name as the summary view without the Z suffix. For example, the interval summary view name for Linux system resource usage is SYLUSEZ. If you hyperlink on one of the rows in this view, the row will be expanded and the data will be displayed in view SYLUSE with one row for each selected interval.

If you do not issue the TIME command while using interval views, data queries are retrieved from the Interval Recorder current interval buffers. If an interval switch has just occurred and no data has yet arrived from a data server, interval (historical) data will not yet be available for viewing. You can either wait for a period of time equal to the Background Sampling Interval (see, Using rules and images), and press Enter or you can issue the TIME command to select a different time frame or more intervals than the current one. For example, TIME * * 2I selects the latest two intervals (if MMLTIR00 member INTVAL=15, this selection is equal to the last 15-30 minutes, depending on how many samples have arrived from the data server).

The views described in, Navigating the menus in MainView for Linux — Servers and Using-views are real-time views. The interval views are not in this book, but you can access them by replacing the R suffix of the real-time view names with a Z suffix. These view names are listed in all of the tables in Using-views (beginning with Viewing system information). One simple way to access all of the interval views is by accessing the EZLNXI easy menu.