Re: Why is the iSeries so slow

["Jim Franz" <franz400@xxxxxxxxxxxx>]

I have similar results as Joe - big files ftp very fast from IFS to pc.
Have you looked at what is between iSeries & pc?
Hubs, bridges, switches? Speed will be negotiated down to
smallest pipe. Check the iSeries TCP/IP interface (in cfgtcp)
and check Max Transmission Unit (i use *LIND as value)
In your memory pools, have you got decent memory in *base pool
(if you have not modified to another pool)
jim

----- Original Message -----
From: <Ken.Slaugh@xxxxxxxxxx>
To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Sent: Wednesday, August 13, 2003 12:52 AM
Subject: RE: Why is the iSeries so slow


>
> OK... I buy it. My calculations are a bit off, but here's the facts, so
far
> anyway...
>
> At 3:30pm I started the GET command. Now it is 9:40pm and the file now
> contains 1,295,330kb. Facts or not, I'm guessing if I were to move the
same
> file to the FTP share of this same PC and use another PC FTP client on
this
> same network the throughput would be much better. History seems to prove
my
> point around here and I'm just trying to find out why the IFS of the
> iSeries can't keep up with reality.
>
> FTP doesn't seem to be the only slow boat up the iSeries river. Simple
drag
> and drop stuff is painfully slow as well and I've got three different
> iSeries boxes in-house and a long list of customer boxes to prove it. I
> suppose if you throw enough money into the iSeries box then it may start
to
> compete with the throughput of some FTP freeware product on a $800 Dell or
> Gateway PC. This shouldn't, of course, be the case and I'm looking for an
> answer to justify the differences.
>
> If the platform is more stable but not fast enough to perform the task in
> an adequate time frame, then stability is a moot point.
>
> Ken Slaugh (707) 795-1512 x118
> Chouinard & Myhre, Inc.
> CA/400 Certified Specialist
> iSeries Network/MSE Administrator
> http://www.cm-inc.com/
>
>
>

>                       "Joe Pluta"
>                       <joepluta@xxxxxxxxxx        To:       "'Midrange
Systems Technical Discussion'"
>                       ers.com>
<midrange-l@xxxxxxxxxxxx>
>                       Sent by:                    cc:
>                       midrange-l-bounces@x        Subject:  RE: Why is the
iSeries so slow
>                       idrange.com
>
>
>                       08/12/2003 09:16 PM
>                       Please respond to
>                       Midrange Systems
>                       Technical Discussion
>
>
>
>
>
>
> > From: Ken.Slaugh@xxxxxxxxxx
> >
> > My current calculations result in a 4gig file taking 15 hours to FTP
> from
> > the iSeries to the PC client's hard drive. Is this for real? Are there
> any
> > tweaks to make this process more reasonable?
>
> Something ain't right there, hoss.  You're throughput is well under
> 1MBit.
>
> A 4GB file is 32,000 megabits.  (Note megabits, not megabytes).  Divide
> that by 54,000 seconds (15 hours), and you get a throughput of about
> half a MBit/second.  This does not compute, Will Robinson.
>
> Let's say you only have a 10MBit network.  That means it should take
> (discounting ack/nak delays) roughly 3200 seconds, or a little under an
> hour to transfer 4GB.  On a 100MBit network, you're talking a few
> minutes.
>
> Now, throw in some delays and normal network traffic, and things stretch
> out a little, but not that much.  I regularly transfer hundreds of files
> between my iSeries and my network PCs using the MGET command of FTP.
> The most recent run included over 400 files totaling 2.5GB.  On a
> non-dedicated 100MBit connection, even including the overhead for
> opening and closing 400 files, it still only took about 15 minutes, for
> a throughput of about 22MBit/sec.
>
> I don't know what's going on at your place, but it's not because the
> iSeries is "not capable of handling" FTP.
>
> Joe
>
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