FTP and data set cataloging

When FTP creates a new data set, it issues a dynamic allocation request to allocate space for the data set and catalogs the data set.

If the data transfer fails when CONDDISP=DELETE, the data set is deleted and uncataloged.

If you are running a job scheduling program that detects files as they are catalogued and then schedules a subsequent job for processing, the job scheduler must take into account that setting CONDDISP=DELETE causes FTP to delete and uncatalog the data set when the file transfer fails. For generation data groups, the following might occur:

FTP intends to create a new GDG(+1) and generates GDG.G00023V00.
FTP of this data set fails and the GDG.G00023V00 data set is deleted and uncataloged.
A follow-on reference for the current GDG, for example, GDG(0), would cause the data set GDG.G00022V00 to be accessed and old data to be processed.