Monitor commands

The monitor supports a number of commands to display information it is tracking. All monitor commands start with the JES2 command prefix followed by a 'J'. These commands are routed directly to the monitor address space and are not seen by the JES2 address space. As a result, there are some limitations on monitor commands; following is a list of those limitations.

JES2 Exit 5 is not called for monitor commands.
JES2 Exit 10 is not called for monitor command responses.
Monitor commands can only originate from MVS™ command sources (consoles, SVC 34, and so on).
Monitor command are not accepted from JES2 command sources such as internal readers, initialization data sets, $M commands, or RJE and NJE sources.
Console message display and limit definitions specified on the CONDEF initialization statement through CMDNUM=, RDIRAREA=, DISPLEN=, DISPMAX=, REDIRECT= parameters do not apply to monitor commands.
Monitor commands can be the object of a JES2 automatic command.

Table 1 lists all the monitor commands and their intended use.

Table 1. JES2 Health Monitor Commands and Intended Use
Command	Description
$JD DETAILS	Displays current hour statistics for resource utilization and CPU sample statistics. The MVS wait table is also displayed.
$JD HISTORY	Displays up to 72 hours worth of resource utilization and CPU sample statistics. The display from this command can be very large (up to 73 lines per resource monitored).
$JD JES	Displays current JES2 information including alerts, trackings, and notices.
$JD MONITOR	Displays status information for each of the monitor subtasks and service information for each module that makes up the monitor.
$JD STATUS	This is the primary diagnostic command for the monitor. It displays the current status of the JES2 being monitored. This display includes all alerts and notices that are current for the JES2 being monitored.
$J STOP	This command shuts down the monitor address space. If the JES2 address space is active, the monitor address space is restarted within a few minutes. This command clears any history the monitor has been maintaining.