> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of McGee, Cletus > Sent: Tuesday, April 18, 2006 1:46 PM > To: [email protected] > Subject: Internal Coupling facility > > Hello World > > We have a Z890-370. We currently are running a single LPAR with both > test and production running in that LPAR. We are looking at > moving into > a SYSPLEX environment using two LPARS (one for test and one for > production) and an Internal Coupling facility. The three engines would > have to be shared across the current LPAR as well as the two new ones > and the coupling facility. I have some 19 different DB2 > subsystems. Some > of those subsystems would need to share data across to the > other LPAR. > > I am wondering about overhead. I have not been able to find any good > reading on how to figure what this might be. I was wondering what the > experience out there thought about this. I would much appreciate your > thoughts and guidance on this. > > Thanks in advance. > Cletus McGee >
Cletus, I would __strongly__ suggest that you get a CFL on your z890 and run the Internal Coupling Facility on that. It will cost money, but will not require any sort of increase in software costs. The internal coupling facility code is designed to run in "active wait" mode. Basically, this means that it runs at 100% CPU utilization regardless of the "useful" activity in it. If you give its LPAR a high weight, then it will negatively impact your z/OS work. If you give its LPAR a low weight, then any CF activity will be elongated, again negatively impacting your z/OS work. There is a DYNDISP ON which decreases overhead, but it again elongates CF activity with the same negative impact. JUST SAY "NO". -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Afforadble Coverage Administrative Services Group Information Technology This message (including any attachments) contains confidential information intended for a specific individual and purpose, and its content is protected by law. If you are not the intended recipient, you should delete this message and are hereby notified that any disclosure, copying, or distribution of this transmission, or taking any action based on it, is strictly prohibited. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
