Re: FTP Speeds

[Larry Bolhuis <lbolhuis@xxxxxxxxxx>]

Pete,
You are correct and as Regan would say "Trust but Verify."  In other 
words even when both are SET to 100M and Full Duplex ALSO verify that 
they report those actual settings. Your i5 shows the correct numbers but 
in my experience it's the switch that will report Half Duplex and speed 
will suck. In addition the stats on the switch port will show huge error 
counters.  In this case you are better off setting both the switch and 
the i5 to Half duplex. While somewhat slower than Full duplex it's 
hugely faster than a mismatch.

A simple test is to bring up in a 5250 screen on a local PC a LARGE 
spooled file. Then stand on Page down. It should go unreadably fast and 
continuously. If it stops every so many seconds for 3 to 5 seconds then 
blasts off again you probably have this problem. Another simple test 
(for Cisco switches) is to stare at the LED indicator the i5 is 
connected to. If it occasionally goes amber that's the port hunting for 
a good match and this is bad.

- Larry.

Pete Helgren wrote:
> Thanks Larry. 
>
> Wow!  Frankie rocks!
>
> i5 settings look like this:
>
> Ethernet standard  . . . . . . . . :   *ALL 
> Line speed . . . . . . . . . . . . :   *AUTO
> Current line speed . . . . . . . . :   100M 
> Duplex . . . . . . . . . . . . . . :   *AUTO
> Current duplex . . . . . . . . . . :   *FULL
>
>
> I'll have to find out who manages the switches (large customer) and then 
> have them tell me what the setting are.  I'll see what they are and take 
> appropriate action. If I understand you correctly, if the switch is 
> Cisco or Dell then I should set the switch and the i5 to have "set" 
> values rather than *AUTO e.g. 100M FULL duplex.  Correct?
>
> Pete
>
>
> Larry Bolhuis wrote:
>   
> > #1 DSPLIND on your i5/OS Line Description. Obseve rhe CURRENT line sped 
> > and duplex settings.
> > #2 Log into your switch and observe the reported speed and duplex 
> > settings for the port the i5 is in.
> >
> >  I) They *MUST match.
> >  II) They *MUST be the same
> >  II) They *MUST identical.
> >
> >  If they are not, then Force them to be so. If it means going back to 
> > *HALF duplex then that's a lot better than what you are getting.
> >
> > If all is good between the switch and your i then check connections 
> > between that switch and the one you are connected to.
> >
> > If I can get 7000KBps from Frankie then anyone should be able to do that 
> > well!!
> >
> >  - larry
> >
> > ps: If you have Cisco or Dell switches and the settings are Auto on both 
> > the switch and your i then you likely have a mismatch and that will 
> > indeed cause this much slowdown.
> >
> >
> >
> > Pete Helgren wrote:
> >   
> >     
> > > I have several large files that I created in the IFS that I am now 
> > > downloading to my PC using FTP.   I files that I am downloading from the 
> > > System i are clocking in a 38.5 Kbytes/sec, which seems pretty slow to 
> > > me since the Ethernet line is configured at 100M and is set for full 
> > > duplex. I am on a 100 mb LAN and have been downloading files all morning 
> > > from the Internet at between 500 and 750 KB/sec.
> > >
> > > Why would I be able to download from the Internet faster than from the 
> > > System i?  Downloads should scream locally, don't you think?
> > >
> > > Pete Helgren
> > >