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Navigate to Servers>>Server Types>>WebSphere Application Server
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Click on desired JVM
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Click on Logging and tracing under Additional Properties
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Click on JVM Logs from the list
To configure the maximum single log file size, you can enter the value in “Maximum Size.” In this ex, I have given 100 MB (by default it’s configured with 1 MB).
To keep the number of historical log files, you can enter the value in “Maximum Number of Historical Log Files. The number in a range of 1 through 200.” In this ex, I have given 30, which will keep 30 log files all the time
Repeat the same configuration for SystemErr.log. Here is the screenshot of above configuration.