Activating the IOA Online Monitor (IOAOMON)

Each IOA Online monitor usually operates 24 hours a day as a started task. Usually the IOA Online monitor is automatically activated as part of the IPL process by the following operator command:

where x is the monitor ID.

The names of the online monitors available in a site are defined in member IOAXPRM in the IOA PARM library. For details, see Customizing the IOA Online Environment.

If the IOA Online monitor is successfully activated, the following message is displayed on the operator console:

After a few seconds the following message is displayed:

If you try to activate more than one IOA Online monitor with the same monitor ID in the same computer, the newly‑activated monitor immediately shuts down and a relevant message is issued.

The IOA Online monitor uses cross‑memory services to communicate with other address spaces requesting services. Like other address spaces using cross‑memory services, whenever the IOA Online monitor is shut down, the address space entry in the MVS Address Space Vector Table (ASVT) remains non‑reusable until the next IPL, and the message IEF352I is issued (in some MVS versions). If the IOA Online monitor is brought up and down many times, the ASVT may become full. New address spaces do not start, and an immediate IPL may be required.

To prevent this problem, specify a large enough value in MVS initialization parameters MAXUSER, RSVSTRT and RSVNONR in member IEASYSXX in the SYS1.PARMLIB library.

For information about these parameters, see the MVS Initialization and Tuning Reference Manual.