JNLWRERR, Error writing journal file xxxx. Undable to update header Region: yyyy

Run Time Error: This indicates that GT.M encountered an error while updating the journal file header as part of trying to open the journal file.

Action: Review the accompanying message(s) for detail on the cause of the error. GT.M automatically closes the current journal file and creates a new one. To reestablish durability, perform MUPIP BACKUP to create a fresh set of journals consistent with the database.