The trace level of an address space specifies how many messages are written to the JESx spool to detail the code paths taken for debugging purposes.
The trace level for all three types of address spaces is specified using the configuration parameter IPTRACE and by default is set to zero. This means that only required messages are written to job log to follow the operation of z/Server to minimize the amount of output generated on the JESx spool.
The IPTRACE level can be dynamically changed using the command
F <holder|scheduler|userserver>,TRACE,LEVEL=x
with x a number from zero to six.
If a problem occurs, most of the time it will be necessary to increase the trace level to a higher setting, generating more messages that can serve as a debugging aid for SupportLine, reproduce the problem and then dynamically decrease the trace level again.
Be aware that trace levels five and six can generate a huge amount of data, depending on the amount of work done in z/Server and the number of users. Indiscriminate use of the higher trace levels can lead to severe JESx spool shortages.