This is a perfectly reasonable goal. We've done it as well for decades. When we merged two IODFs (one per data center), we faced the issue of duplicate device addresses, which had evolved because, with two separate IO configs (even pre-IODF), it didn't matter much. With a single IODF, most devices *must* have unique addresses, especially DASD and tape. We had to readdress some devices in order to avoid duplicates.
Consoles do not have to be unique because you connect them to some LPARs and not to others. So in both data centers, we have a console defined as 01234, but 'it' represents two different physical devices. No conflict. With DASD and tape, however, you should address every one uniquely. I highly recommend combining IODFs. You get a single representation of your entire enterprise. We used to have a problem keeping multiple IO configs in synch. With a single IODF, no problem. As to moving an IODF, we maintain a single IODF on one system and use a built-in migration process in HCD to send it to others LPARs. Every system uses an identical copy with the same name. . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 323-715-0595 Mobile 626-543-6132 Office ⇐=== NEW [email protected] -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Jerry Whitteridge Sent: Friday, July 10, 2020 11:29 AM To: [email protected] Subject: (External):Re: EXTERNAL EMAIL: Two Processors and One IODF CAUTION EXTERNAL EMAIL We maintain 3 processors and a CF across 2 datacenters in the same IODF. If you want to be able to see a complete view of all of your devices and connections across all of your raised floor it’s the only way to do so I believe. It also allows us to maintain our DR configuration in sync with everything else. Jerry Whitteridge Manager Mainframe Systems & HP Non-Stop Albertsons Companies -----Original Message----- From: IBM Mainframe Discussion List <[email protected]> On Behalf Of Michael Babcock Sent: Friday, July 10, 2020 11:20 AM To: [email protected] Subject: EXTERNAL EMAIL: Two Processors and One IODF We are in the process of bringing DR back in-house and have a new z15-T02 in our new facility (our current "home" machine is a z14-ZR1). I want to be able to manage both processors from a single IODF. I'd like to have the same CHPIDs, CUs, and Device addresses both at home and in our DR machine. I have the new processor defined in our current IODF and have used the CHPID mapping tool to map the PCHIDs to CHPIDs. I have tested adding devices with the same address to both processors and that seems to work (as long as I define the CUs to both processors first. I tested adding a range of 16 tape drives). My questions are this: 1. Is this something we even want to do (same IODF, same device addresses)? 2. What's the best way to move the IODF at home to the DR machine? 3. Are there any gotchas we need to watch out for? 4. We have IBM DS8886s and are using Metro Global Mirror Multi-Target w/Practice. Any concerns here? 5. Am I crazy for even entertaining this idea? 6. Any alternatives I need to consider? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
