That was my thought also. My last question to him (off list) had been:
was the disk where it came from also CMS formatted in 4096 blocks, like
the current one? Could the block size formatting make a difference for
single-file capacity, Alan? He claims the original file was on a CMS
full pack minus cyl 0, so he feels it should fit on a pack of the same
number of cylinders.

David Wakser

-----Original Message-----
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Alan Altmark
Sent: Thursday, July 01, 2010 12:27 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Large file transfer capacity

On Thursday, 07/01/2010 at 10:58 EDT, Nikolai Dorozhko <doros...@iba.by>

wrote:
> Hello collegues, developers. 
>   
> Trying to download/upload   a CMS binary file > 2G to PC   under  z/VM

 4.4. 
> 
> VM FTP aborts when transfer  reaches 2G, 
> 
> IND$FILE downloads , but does not upload.
> 
> What to do ?   Will  the new VM releases help?

In the screenshot you provided to David Wasker, there was an important 
clue:
  552 Data transfer aborted due to disk overflow

That error only appears if CMS thinks the disk is full. 

Alan Altmark
z/VM Development
IBM Endicott

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