RE: PTF FTP download speed

Thanks for the info. I just may setup a 2nd ftp session.


Paul


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
DrFranken
Sent: Tuesday, January 19, 2016 3:44 PM
To: Midrange Systems Technical Discussion
Subject: 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
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

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

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