Re: BAD ethernet (TCP/IP - ftp) performance on new AS/400?!?

[Larry Bolhuis <lbolhui@xxxxxxx>]

Pedro,

  I have not experienced this but here are a few thoughts:

  Have you run Performance Tools to collect Line and IOP utilization for
the ethernet line?  As a starting point this should rule in or out
whether there is an overload there.

  Is the performance poor all the time or only when the system is busy?

  Do you have any tools (sniffer etc) for the LAN to determine if the
network is being overloaded?  

  Have you checked the Maximum Transmission Unit parameter on the TCP/IP
Interface (CFGTCP menu option 1)?  It should be set to *LIND.  Also
check the line description parameter under SSAP the Maximum Frame Sizes
should probably be set to 1496.    Lower numbers for either of the above
increase the number of frames on the net, increasing collisions and LAN
IOP utilization, and decreasing throughput.  If you have a large
network, confer with those in charge of your LAN/WAN setup before
changing the line description.

  Also are there enough FTP servers running?  Use CHGFTPA and F4. This
will show the initial number of servers to start. The default is 3 and
this is generaly enough for light traffic.  To few and there may not be
a server available when a transfer starts, to many and the AS/400 is
taxed starting and maintaining jobs it doesn't need.

HTH - Larry Bolhuis
      Arbor Solutions, Inc
      lbolhui@ibm.net

Pedro Manuel Rodrigues wrote:
> 
> Good day to you all. Does anyone have been having huge performance
> problems while transfering data from and to the AS/400? I mean, we
> had a previous problem with a 600 running V4R1M0 and other systems
> - transfers between those systems and the 600 would crawl to a an
> halt. Also, folder access was very slow and TCP/IP performance (FTP
> for instance) was around 5KB/10KB second. Now, with a new 170 with
> V4R2M0, things are even worse. The machine is fast, but FTP'ing a
> file to the new machine gets me 1KB second transfers, when it does
> transfers it to the end. Quite nice indeed. Any ideas?
> 
> Thanks in advance,
> 
> Pedro Rodrigues
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