RE: FTP file size limitation?

I've found FTP times are determined by many factors, chief of which is
how you are connected.  

LPAR's using Virtual Ethernet or Virtual OptiConnect (or "real"
OptiConnect, for that matter) will outperform those going over a LAN,
usually.  

I've also found that on 8xx boxes, Virtual OptiConnect outperforms
Virtual Ethernet, but the opposite is true on i5's.  

In either case, the system processing and memory load can affect
transfers as well.

In my own tests on i5, for instance, I got an effective rate (that is
actual data across the pipe - meaning effective rate of 1Mb/s would mean
a 1Mb (Mbits, so about 125MB) file took 1 second to FTP) of about
500Mb/s for Virtual Ethernet (using the jumbo frame size of 8996) and
about 400 Mb/s for Virtual OptiConnect.  Virtual Ethernet with the
default frame size of 1496 was a bit over 300Mb/s.  

So at the fastest of those rates, a 35GB file (a.k.a. 286720 M bits)
would take about 9 hours to FTP (if my math is right!).  

 
 
Jeff Carey
Acxiom Corp.
Phone: 630-944-0216
Fax:  630-944-8941
Pager: jeff_carey@xxxxxxxxxxxxxx
Vote for me for COMMON Board of Directors:
http://www.common.org/about/carey.html

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of fbocch2595@xxxxxxx
Sent: Tuesday, May 16, 2006 12:58 PM
To: midrange-l@xxxxxxxxxxxx
Subject: Re: FTP file size limitation?

Can you give me a time estimate on how long those large files took to
ftp?  
 
 
-----Original Message-----
From: Chris Bipes <chris.bipes@xxxxxxxxxxxxxxx>
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>
Sent: Tue, 16 May 2006 10:29:58 -0700
Subject: RE: FTP file size limitation?


I sent bigger files between the systems. 


Christopher Bipes
Information Services Director
CrossCheck, Inc.

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
ChadB@xxxxxxxxxxxxxxxxxxxx
Sent: Tuesday, May 16, 2006 10:28 AM
To: Midrange Systems Technical Discussion
Subject: Re: FTP file size limitation?


OK... i'll bump this one, maybe I caught people at lunch.

Is a 35gb file FTP'd between 2 iSeries boxes an outlandish proposition?