Accelerate FTP uploads to zD&T

Strongback Consulting

When uploadding to an IBM zD&T system, you may experience painfully slow upload times. I’ve had 5MB files take 30 minutes to upload. After much digging, I discovered a quick fix. Run the following command on the Linux host. In my case it was Ubuntu:

ethtool -K eno1 gro off

Ethtool is used for querying and changing an ethernet adapter. This command changes the offload parameters, specifically the generic offload parameter is turned off. This will change the upload FTP speed to the z/OS (MVS or USS) to a much more acceptable level. Change “en01” to the primary Ethernet adapter which is bound to your external IP of the Linux host (assuming your zD&T is configured to do NAT).

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