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6. Problem Determination

This part of the Co:Z User's Guide contains information to help you diagnose problems with the Co:Z Launcher.

6.1 Co:Z Toolkit Component Overview

The following diagram illustrates the processes that occur (on z/OS and the target system) when running the Co:Z Launcher:

6.2 Common Logging/Tracing Options

Several aspects control the logging of messages and trace information in the Co:Z toolkit:

The logging level

A threshold level: eMergency, Alert, Critical, Error, Warning, Notice, Info (default), Debug, and Trace. Fine. Each message has a level and will only be logged if that level is at or below the current logging threshold.

The component's logger object

Each major component (C++ object) in the system will typically have its own logger, which can have its own threshold level set, or can use the default threshold.

The common logging destination

All logger messages eventually go to the same logging logging destination, which defaults to stderr, but a specific file, a user-written routine, or the SYSLOG facility may also be used.

Logging options are set using either the -L command-line switch or by by setting the COZ_LOG environment variable. In either case, the value of the setting is a list of one or more of the following values:


The default logging threshhold: eMergency, Alert, Critical, Error, Warning, Notice, Info (default), Debug, Trace, Fine.


Prefix log messages with a system timestamp.


Include consumed cpu time in log messages.


Messages are logged to the given filepath instead of stderr.


Messages are logged to SYSLOG facility instead of stderr.


Set a specific log name to the given threshold

6.3 Enabling Component Logging

The following examples demonstrate how to enable logging for various Co:Z toolkit components:

Set the default logging threshold for the batch launcher job

The following example uses the -LT command switch to set the default logging level to "Trace" for all components in the batch launcher job (but not the target system components). The t option is also used to prefix all messages with a timestamp.

//COZLG1  JOB (),'COZ' 
//        ARGS='-LT,t' 
//STDIN   DD * 
# This is input to the remote shell
echo "We are running on: " `uname -sr`

Set the default logging threshold for the target system components

The following example uses the agent-options property to set the -L command line switch to configure CoZAgent logging.

The example also sets the target system environment variable COZ_LOG to set logging options for all other target components. Environment variables for the target system can be set using the target-env- property prefix in the Co:Z Launcher configuration properties DD (COZCFGD).

//COZLG1  JOB (),'COZ' 
//        ARGS='' 
//STDIN   DD * 
# This is input to the remote shell
echo "We are running on: " `uname -sr`

Enabling ssh diagnostic messages

It is sometimes useful to increase the verbosity of ssh itself to determine a problem source. To do this for the ssh client (used by the Co:Z Launcher process), add one or more v switches to ssh-options property in COZCFG:


More v's increase the debug level. Note that ssh can produce lots of output.

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