We are getting u901 abends in the Telon Design Facility(TDF). We ran verify's against the Telon permanent VSAM files, and they all showed no bad blocks for the TDF VSAM files.
We tried to do an unload of the TDF and also received a u901.
The best resolution for this U901, is to restore the Telon VSAM files(permanent files).
Backups should be taken depending on the amount of activity within the Telon Design Facility.
Daily, 2-5 times a week, or weekly.
Please review the CA Telon® Application Generator Message Reference Guide r5.1,
Chapter 6: Abends with TDF on the Mainframe.
Identifying the Cause of U901 Abends