ABENDRATE, MESSAGEMAX and COMMANDMAX Parameter Recommendations

Products

• OPS/MVS Event Management & Automation

Issue/Introduction

What are the recommended values for the parameters MESSAGEMAX, COMMANDMAX and ABENDMAX to prevent an emergency shutdown of OPS/MVS.

Possible error messages due to one of these parameter values being exceeded:

OPS3146S EMERGENCY PRODUCT SHUTDOWN STARTED - MAXIMUM COMMAND RATE EXCEEDED   
OPS3146S EMERGENCY PRODUCT SHUTDOWN STARTED - MAXIMUM MESSAGE RATE EXCEEDED
OPS3146S EMERGENCY PRODUCT SHUTDOWN STARTED - MAXIMUM ABEND RATE EXCEEDED    

How to prevent this situation?

 

 

 

 

 

 

Environment

OPS/MVS

Cause

OPS/MVS threshold parameters are used to shut down OPS/MVS to prevent degradation to your automation and possibly the entire z/OS system.

Resolution

There are no recommendations that are valid for all environments, as each setup has its own unique requirements and constraints.

Many customers use the values below for these parameters:

COMMANDMAX 4000
COMMANDRATE 100

MESSAGEMAX 10000
MESSAGERATE 1000

ABENDMAX  500
ABENDRATE 0.2

As a general rule, check the value of the parameter COMMANDHIGH, MESSAGEHIGH and ABENDHIGH on the OPSVIEW panel 4.1.1. If they are reaching their respective maximum values then consider to increasing these values.

NOTE:  There are no repercussions to overhead, process blocks, etc by increasing these values.  The main consideration is to set the value high enough so that an emergency shutdown is not invoked unnecessarily, but high enough so as to stop any run-away process.