Re: Sterling Communication Issue

Tue, 20 Feb 2001 21:01:14 -0800

Brian,
I have experienced the same types of issues with emulator software dialing into VANS
in the past. The issue arises from fluxuations on the VAN's computer where the target's
IO intensity varies due to demand or load. There is no sure way to mitigate the problem
except to extend your wait periods for certain commands to appear and providing the time
for the target system to respond.
If you have no delays built into the login banter exchanged between the systems, then the
target may be looking for a login name while your process is attempting to send a password
or a return to get the target's attention. You must provide a delay in the process to give
the target time to respond to the return or the transmission of the login name or password.
If you don't and the target is IO bound, then the two separate processes will get out of
step with each other and more then likely hang until the target times out or worse, just
hang in the attempt to connect.
FTP will still behave like a login attempt from the initiator to the target and can be
effected by IO bound events where the target is slow to respond. I will admit that I do
not know if there is a way to imbed delays into an FTP script file, but I think that you
will need to accomplish that to ensure that the initiating system does not overrun the
target. The key to success here is to slow down enough to take into account the IO loads
that may be placed on the target such that the number of connection attempts rise to the
90% or better range. The down side is that the communications process will also get longer
in it's start to finish time. Hope this helps....
Regards,
Mark
-----Original Message-----
From: Test, Brian [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, February 20, 2001 5:11 AM
To: [EMAIL PROTECTED]
Subject: Sterling Communication Issue
Hi everyone,
This list has been of incredible value to me in the past, and I hope that I
can tap your knowledge and experiences again. We currently connect to
Sterling via frame-relay using FTP, and our gateway is Unix based with a HP
box, and we use TLE 4.1 as a translator. I hope that covers all the info
that you might need.
The issue is that we randomly can not connect to Sterling, and sometimes
their system is down. However, most of the time when this happens, their
system is up, and when we try to connect, we become frozen and the system
will time us out. The freezing takes place at the point of logging into the
Sterling system.
I was wondering if anyone else had a similar issue, and might be able to
suggest a way to resolve this issue.
As always, thanks for your help.
Brian Test
E-Commerce Analyst
ACCO North America
300 Tower Parkway
Lincolnshire, IL 60069-3640
(800) 222-6462 x3973
(847) 419-4140 FAX
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
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