We have jobs that loop through FTP sessions, one at a time, to get mainframe datasets and land them on our DataStage server. Tracing indicates that ACK is delayed, with only 3 or 4 data packets being transferred at a time. FTP settings are generic -- one multiple-instance parallel job is re-used in each loop, consisting of FTP Enterprise input to Sequential File output, transfer mode is binary, with EBCDIC being maintained at both ends. Log on and data port connections are confirmed at the start of each session, and the only error message we see is
Code: Select all
error in readCommFifo or ftp command function.
I've disclosed as much detail as I'm allowed to here. We will rerun our trace from both sides concurrently next week to see if the Unix process is at fault. For now we just have messaging from the mainframe server side.