Re: CHGTCPA buffer sizes

[DrFranken <midrange@xxxxxxxxxxxx>]

For "Many Moons" IBM i Defaulted to 8K for this. I believe it was i 6.1 
that changed this to 64K but only on a new install, an upgrade did not 
change it. So 64K is a good starting point. You may want to experiment 
with even larger numbers, for example I use 1MB on the system I get PTFs 
from IBM with.  I also do parallel downloads and achieve from 4,500 to 
5,000 MB download speeds on each parallel download.


        - Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 3/5/2016 9:02 AM, Rob Berendt wrote:

> Awhile back I complained about how long it took to ftp down 1-4GB image
> catalog files from IBM straight to my IBM i.
> It was suggested that I run CHGTCPA and change the buffer sizes.
> I did and, OMG, what a difference that made!
> I made the buffer size 65k.  I think it was around 8k.
> Instead of hours and hours the 4GB one was done in about 45-50 minutes.
>
> I also broke them up into 7 separate downloads running at the same time in
> batch.
> So I'm still really not taxing the communications line.
>
> I used to order them also on media and often the media beat the download.
>
>
> Rob Berendt