Achieving optimized operation

Experience has shown that the most suitable parameter settings can only be achieved in stages.

Initially the openFT default values should be left unchanged. In most cases it will be possible to run file transfers satisfactorily using these parameter values.

If not, however, as a second step an improvement can be sought by changing one of the parameter values. It is normally not advisable to change more than one parameter at a time as otherwise there is no way of ascertaining the precise effect of each change.

If satisfactory operation of the FT system has still not been achieved, the FT administrator can repeat the second step, changing a different parameter.

The FT administrator can control the operation of the FT system using the parameters PROCESS-LIMIT, CONNECTION-LIMIT, TRANSPORT-UNIT-SIZE and MAX-REQUEST- LIFETIME, see the following table:

Problem	Suggested solution
Poor dialog response times	Reduce TRANSPORT-UNIT-SIZE Reduce CONNECTION-LIMIT
Computer overloaded, network load not yet optimized	Set PROCESS-LIMIT to 1 or 2 Increase TRANSPORT-UNIT-SIZE Reduce CONNECTION-LIMIT
Computer and network overloaded	Set PROCESS-LIMIT to 1 or 2 Reduce CONNECTION-LIMIT
Throughput inadequate	Increase TRANSPORT-UNIT-SIZE Under TCP/IP: Set RFC1006 transport protocol (see FTADDPTN command)
Prolonged requests block other requests	Increase CONNECTION-LIMIT
Requests to a particular partner system use up all resources	Set the partner system to low priority with PRIORITY=*LOW Increase CONNECTION-LIMIT Set REQUEST-PROCESSING=*SERIAL for the corresponding partner system.
Requests from partner systems (inbound requests) use up all resources	Increase CONNECTION-LIMIT
Requests are present in the request file for a very long period without being processed.	Set MAX-REQUEST-LIFETIME

The command used for this purpose is FTMODOPT . These parameters are discussed in the sections below. In addition, the effect of changing the parameters is also described.