ERROR: too many open files OM Web Viewer 12.1 for USS unresponsive

Products

• Output Management Web Viewer

Issue/Introduction

The production server became unresponsive and needed a restart to bring back services. 

The message in the log is ''too many open files''.  There has been an increase in users of this product.

Does the application need tuning?

 

Environment

Output Management Web Viewer for USS 12.1
Apache Tomcat®

Cause

Heap size too small; Open file limit too low

Resolution

• We do definitely recommend that the minimum and maximum heap sizes be increased. The minimum should be at least:
  "-Xms 512m"
  The maximum should be whatever the LPAR USS will allow you. Start with trying:
  
  IJO="$IJO -Xms512m -Xmx4096m"
  
  ...and if that maximum is not supported, the task will fail at startup with the error that 4096m was not available. From there try -Xmx-3072m, and so on. If you are unable to get at least 2048, I would recommend requesting more for the USS system.
• Up the Open files limit for the user who runs Apache Tomcat®/ OM Web Viewer .