As you have determined, it seems that MODE B (Block Mode) is the kicker.  Using 
XMIT or TERSE would eliminate the need for MODE B.  But we all know there is 
CPU consumption from using those two utilities on both ends. 




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On Thursday, March 28th, 2024 at 10:31 AM, Jousma, David 
<000001a0403c5dc1-dmarc-requ...@listserv.ua.edu> wrote:

> And all lpars are at the same levels of software.
> 
> Dave Jousma
> Vice President | Director, Technology Engineering
> 
> 
> 
> 
> 
> From: Jousma, David david.jou...@53.com
> 
> Date: Thursday, March 28, 2024 at 10:30 AM
> To: IBM Mainframe Discussion List IBM-MAIN@LISTSERV.UA.EDU
> 
> Subject: Re: Slow FTP's
> Max,
> 
> As mentioned, the 50Gb file with MODE B and EBCDIC is slow. Same file just 
> binary mode, it is fast. Of course, cant transmit a DSS dump as just binary.
> 
> Dave Jousma
> Vice President | Director, Technology Engineering
> 
> 
> 
> 
> 
> From: IBM Mainframe Discussion List IBM-MAIN@LISTSERV.UA.EDU on behalf of 
> Massimo Biancucci 000005a019256424-dmarc-requ...@listserv.ua.edu
> 
> Date: Thursday, March 28, 2024 at 10:26 AM
> To: IBM-MAIN@LISTSERV.UA.EDU IBM-MAIN@LISTSERV.UA.EDU
> 
> Subject: Re: Slow FTP's
> Dave, it becomes more interesting. Could it depend on the file data itself ? 
> Have you tried a BIG file, EBCDIC with mostly the same data inside ? Same 
> kind of transmission, MODE B and EBCDIC. Regards. Max. Il giorno gio 28 mar 
> 2024 alle ore
> 
> 
> Dave,
> 
> 
> 
> it becomes more interesting.
> 
> Could it depend on the file data itself ?
> 
> 
> 
> Have you tried a BIG file, EBCDIC with mostly the same data inside ?
> 
> Same kind of transmission, MODE B and EBCDIC.
> 
> 
> 
> Regards.
> 
> Max.
> 
> 
> 
> 
> 
> 
> 
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