Why and when to perform this task
WebSphere Application Server for z/OS uses an error log to record error information when an unexpected condition or failure is detected within the product's own code. Such unexpected conditions or failures include:
Because WebSphere Application Server for z/OS is predefined as a z/OS system logger application, you can use a log stream as the product's error log. Doing so offers the following flexibility:
ras_time_localto control whether timestamps in the error log appear in local time or Greenwich Mean Time (GMT), which is the default.
When your installation first customizes and verifies WebSphere Application Server for z/OS installation, you have the option of defining the error log as a log stream. Using the ISPF customization dialog to configure a base application server node, you can specify log stream characteristics, including sizes. After verifying installation, you can change the log stream used for normal operations.
For additional information about z/OS log stream requirements, access the z/OS MVS Setting up a Sysplex, SA22-7625 available on the z/OS Library Web page