• Subject: RE: How long to FTP a SAVF
  • From: "Alex Moore" <alexm@xxxxxxxxxxxxxxxx>
  • Date: Sun, 28 Jan 2001 14:29:40 -0500
  • Importance: Normal

Leo,

Also, check your MTU throughout your network.  Go with the lowest common
denominator to prevent fragmentation.  We ended up replacing a ethernet card
on one occasion to fix a performance problem.  No high level messages at
all, just bad performance.  Took several comm traces to iron it out. Early
versions of ethernet cards on 6xx models need the IBM supplied pigtail
removed.  Check with your CE.  I didn't believe it till I saw the impact.

Alex


I wouldn't be too ready to blame this on the AS/400 FTP support. We do FTPs
between CISC (V3R2, D20) and RISC quite frequently. And the save files are a
*lot* bigger. I don't ever recall getting this poor through-put. It is true
that FTP and TCP services on the CISC boxes are implemented "above the OS",
and IBM improved both protocol and server performance in RISC, but you
shouldn't be seeing this type of performance.

Some things to look at:

1. Are you running the FTP transfer in batch? If so, what priority does it
have? How much pool memory, etc.? If it is running in batch and other
applications are running at a higher priority you will see degraded
performance.

2. What do you have defined for the frame size on the Ethernet line? Very
small frame sizes can degrade FTP performance.

HTH,
Patrick

Subject: How long to FTP a SAVF


> I thought I had a good plan:
> 1) Save to *SAVF on System 1 (V3R2), Model D60;
> 2) FTP *SAVF to System 2 (V4R5) Model 720;
> 3) Restore *SAVF to System2.
>
> The two systems are side by side, connected through a 10 mg hub.
> Testing the process take EXTREMELY long time.The *SAVF contains 905,985
> records (records are 528 long). 9 hours after the start of the process
> the job display shows only 50,000 I/Os.
> I can FTP between my PC and the server at a much faster rate through a
> simple modem-to-modem connection (capable of 56k).
>
> What am I missing?

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