Re: PTF FTP download speed

We also have 'big pipes' to the internet and for quite a while would see download speeds of 600 or 700 K. Then something changed, I suspect routing and suddenly we track about 2800KB.

ALSO Be aware there is a limit to how fast one single FTP session can go across the net and more hops is NOT better as you may suspect.

Note that I said SINGLE. So set up your batch jobs to run in parallel, each getting a single image. With this we get pretty much the same speed on every file and I've had as many as a dozen running all at once with only minor reduction in individual file performance.

As Rob mentioned use CHGTCPA to increase the buffers there too they helps on these many hop transfers.

- Larry "DrFranken" Bolhuis

www.Frankeni.com
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On 1/19/2016 3:21 PM, rob@xxxxxxxxx wrote:

Even though we have a smoking hot internet connection I experience your
results also. You may want to prompt CHGTCPA and see what you have for
TCP receive buffer size
TCP send buffer size .
I swore I changed these up to 65535 at our last IPL but they seem to be
back down to 8192. I just changed it on the fly. Others have encouraged
me to do so. There's even a Websphere install thing that I've seen which
encourages you to kick it up to 65535.
I have literally ordered them on physical media and have them beat the
internet. I suggest you run this in batch so that you can disconnect your
session at night. Or use your HMC remote console capability to do it that
way.


Rob Berendt