If you experience behavior that is inconsistent with the documented behavior of XMS, you can use the First Failure Data Capture (FFDC) records generated as a result of the failure to help determine the cause of the problem.
After detecting an error, look in the application's current working directory for files with an .FDC extension, and then use the textual information that these records contain to investigate the failure and determine whether you can resolve the problem yourself or whether you need to call your IBM Support Center for assistance.
The type of FFDC record that XMS generates depends on the type of failure that has occurred. There are two distinct types of FFDC record:
It is likely that IBM Support representatives will ask for details of the FFDC records that were written from the application process. If additional information is required to help diagnose the problem, the IBM representative may direct you to provide product trace. It may be necessary for you to capture product trace over an extended period of time, during which the behavior that you noted must be demonstrated to allow the problem to be diagnosed. If you are asked to provide trace, the representative will advise you on which trace options to use and on the diagnostics that you need to send to IBM.