We have three CECs residing in two data centers. Counting both production and DR LPARs, we have upwards of two dozen altogether. All disk and tape are cross connected locally or via DWDM, so that every LPAR is connectable to every device. The whole enterprise is mapped by a single IODF where geographic boundaries are entirely invisible. We know where such and such CEC or DASD device is located, but IOS has no idea.
Every LPAR must have a copy of the current IODF in order for this to work. For redundancy and backup, we supply all sysplexes (some mono) with a shared copy of SYS1.IODFxx. The IODF is created and maintained on one sysplex and propagated to every other sysplex using the standard HCD utility CBDMGHCP. LOADxx in IPLPARM is set to '--' for IODF number, so once a new IODF is activated dynamically or via POR, it will be found on the next IPL without any sysprog intervention. The IOCDS in each CEC is updated from 'system zero' via HCD Option 2.11 ' Build and manage System z cluster IOCDSs, IPL attributes and dynamic I/O changes'. In previous discussions on IBM-Main, others have indicated different strategies for accomplishing the same goal. There is not one right way to do this, but of course there is one best way. This is it. ;-) . . 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 [mailto:[email protected]] On Behalf Of Mohamed Juma Sent: Sunday, January 15, 2017 3:36 AM To: [email protected] Subject: (External):Re: The best practice of IODF in big system Dear Alan, PROD CEC 1: Two LPARs one Z/OS, and one ICF. PROD CEC 2 : Two LPARs Z/OS CF CEC any z/OS lpars? No TEST CEC: Three LPARs, one ICF, two Z/OS DR CEC how many lpars? Two ICF one TEST, one PROD- Three Z/OS one TEST and two PROD. Do the lpars share DASD? Yes all of them sharing two DASD in both HO and DR. Are the lpars in a SYSPLEX? two SYSPLEX one for TEST includes all TEST LPARS in both Sites. One SYSPLEX for all PROD LPARs in the two sites. How do you update the DR DASD? via PPRC Do you have real time replication? Yes Thanks Mohamed Gomaa From: "Field, Alan" <[email protected]> To: [email protected] Sent: Sunday, January 15, 2017 1:18 PM Subject: Re: The best practice of IODF in big system Mohamed, more questions: PROD CEC 1 how many lpars PROD CEC 2 how many lpars CF CEC any z/OS lpars? TEST CEC how many lpars DR CEC how many lpars? Do the lpars share DASD? Are the lpars in a SYSPLEX? How do you update the DR DASD? Do you have real time replication? Alan -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Mohamed Juma Sent: Sunday, January 15, 2017 4:32 AM To: [email protected] Subject: The best practice of IODF in big system Hi, We have 3 CECs in PROD System (two Z/OS and one External CF), one TEST and one more CEC in DR site, I combined them in one IODF.I want to know the best practice to copy the IODF to each CEC, and also the IOCDs without suffering from H/W and S/W mismatch. Mohamed Gomaa ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
