Problem solve Get help with specific problems with your technologies, process and projects.

The particulars of running a CICS transaction server

I want to run CICS transaction server(TS) 1.3 and CICS 4.1 on the same LPAR. For compatibility, can I run with the TS 1.3 SDFHLPA in the LPALIST and the type 6 SVC in the Nucleus? Will this cause any problems with CICS 4.1? Is there a recommended way to run the two in the same LPAR?
The SVCs can be migrated without any problems. If you want to use the same SVC numbers, then install the CTS 1.3 ones and IPL. The out-of-service 4.1 will happily run with these newer SVCs. If you don't want to risk using the CTS 1.3 SVCs in the 4.1 region, then just use different numbers for the CTS 1.3 SVCs.

However, you cannot share LPA resident modules in this fashion. One of the regions must use LPA=NO and the other run with LPA=YES in the MVS image. I'd suggest running your existing 4.1 regions with LPA=NO for a day or two to determine the performance impact. Then, if this is acceptable, use LPA=YES in the (newer) CTS 1.3 region as this is where you will get the best benefit. Otherwise, use LPA=NO in the CTS 1.3 region and then only go to LPA=YES (with an IPL!) when all the 4.1 regions have gone away.

Robert Harris
CICS Technical Strategist -- CICS expert at Search390.com

Editor's note: Do you agree with this expert's response? If you have more to share, post it in one of our .VO7aaqqaAFk.0@/search390>discussion forums.

Dig Deeper on IBM system z and mainframe systems

Have a question for an expert?

Please add a title for your question

Get answers from a TechTarget expert on whatever's puzzling you.

You will be able to add details on the next page.

Start the conversation

Send me notifications when other members comment.

Please create a username to comment.