RE: FTP "Keep Alive"

["Paul Nelson" <nelsonp@xxxxxxxxxxxxx>]

Thanks. Will check the program. I inherited it, so I get to go back to
square one.

Paul Nelson
Office 512-392-2577
Cell 708-670-6978
nelsonp@xxxxxxxxxxxxx


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of John Jones
Sent: Thursday, March 19, 2009 10:06 AM
To: Midrange Systems Technical Discussion
Subject: Re: FTP "Keep Alive"

This is from memory so I could be wrong, but within FTP there are two
channels - one for commands and one for the data.  The timeout is, IIRC, for
the command channel so it can timeout regardless of the state of the data
channel.  During the actual file transmission the command channel is idle
while data is flowing.  Hopefully Scott or someone else more intimately
familiar with FTP's innards than I can correct me if I'm wrong.

Up the timeout value.  Upping the buffer sizes may help but I doubt it would
be significant.  That's probably more of an issue when the system is
handling lots of simultaneous conversations or when the comm line is
error-prone.

Also, if you haven't already, add DTACPR(*MEDIUM) to the save command.  At
the price of a little CPU and slightly longer save time, the size of the
SAVF can be greatly reduced (especially for data; not as much for
programs).  Smaller file = faster transmission = less chance of a timeout
(also = less DASD used).  Example: We've saved 140GB data libraries to 17GB
SAVFs.

On Thu, Mar 19, 2009 at 8:54 AM, <elehti@xxxxxxxxxxxxxxxxxx> wrote:

> Paul,
> here are some tips from Oracle to Keep Alive and not timeout FTP of huge
> files.
>
> - Change the TCP/IP buffer size on your System i to 65536, using the
> following command:
>    CHGTCPA TCPRCVBUF(65536) TCPSNDBUF(65536)
>  - Set the QINACTITV System Value on your System i5 to *NONE, using the
> following command:
>     CHGSYSVAL SYSVAL(QINACTITV) VALUE(*NONE)
> - Note the original value of this System Value so you can set the system
> value back after the download.
>
> ++++++++++++++ tips below apply to FTPing to your PC -------
> - Use a Windows workstation with at least a 1 GHz processor, 1GB of
> memory and 7 GB of free disk space.
>  - You will probably need double the size of the download files as open
> space on your Windows workstation hard drive.
>  - Do not run other Windows programs while downloading.
>  - Consider running the downloads after normal business hours, or when
> network traffic is low.
>  - Run the installation from a local workstation or server.
>  - If your Windows workstation or server also has a wireless network
> connection, disable the wireless connection before starting a download.
> - Set your network card to maximum speed, such as 100mb/full, unless you
> are on a cable modem connection, in which case you should leave the
> network connection speed set to Auto.
> Eric Lehti
>
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