Re: What's magic about these numbers?

From: Joe Pluta <joepluta@PlutaBrothers.com>
> In any event, no matter what I try, the most I can seem to get up to the
IFS
> is 4,293,918,720 bytes, which is exactly one meg (1,048,576 bytes) shy of
> one true gigabyte (I will refer to this number as "1GB-1MB").
>
> Checking, I found an IBM document
> (http://www.as400.ibm.com/tstudio/tech_ref/syslimit/limitv45.pdf)
purporting
> that the supposed limit for IFS files in V4R5 is 256GB.  But I also know
> that 4GB is a magic number, being exactly 2^32.  My question is this: is
> there really a "phantom" upper limit of just under 4GB to file sizes on the
> IFS?
>

I don't *know* the answer. It is perfectly possible that the limit in IFS is
256G,
but that some of the programs (e.g. FTP) uses 32-bit unsigned integers and
therefore get in trouble around 4G.