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IOCDS and IODF

 
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farhad_evan

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Joined: 30 Aug 2014
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PostPosted: Tue Mar 14, 2017 3:27 pm    Post subject: IOCDS and IODF
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hi expert
i know we must define system configuration in IOCDS .
do i need to define same configuration in IODF on my LPAR ? (like control unit, partitions, channel paths, ... except I/O device)
I mean if I define one channel as share on system (in IOCDS) , do i need to define it on all IODF ? and what problem can happen if i don't define every thing in IODF ?

thanks
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farhad_evan

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PostPosted: Sat Mar 25, 2017 6:14 pm    Post subject:
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is my question in right place ?
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Robert Sample

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PostPosted: Sat Mar 25, 2017 8:52 pm    Post subject:
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Your question is in the right place. I think you need to read the z/OS HCD User's Guide manual again. It says, among other things, that:
Quote:
Build an IOCDS

When a production IODF has been created, you can build an IOCDS (it can be built only from a production IODF). Processors may have varying numbers of IOCDSs. A particular IOCDS is used at POR time to make the configuration data known to the CSS.
Your questions imply that IOCDS and IODF are distinct and that the IOCDS is built first -- the quote from the manual clarifies that your thinking is the exact reverse of the way things happen. The IOCDS is built FROM the IODF, so the IODF must exist first. And yes, except for I/O devices, the various IOCDS will have the same configuration from the IODF (unless you change the production IODF before building an IOCDS in which case it may be different -- but all the IOCDS built from a single production IODF will have the same configuration).
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farhad_evan

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PostPosted: Sun Mar 26, 2017 10:51 am    Post subject:
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hi Robert, thanks for your reply
Let me explain about my experience, For a develop system (First LPAR in new machine) I saw a CE man defined all I/O devices in a file on support element (I think that was IOCDS) after that he used POR.
when i checked the IODF I figured out just unit address has been defined on it. SE man didn't define any information about channel, path, control unit and port ... and he just defined unit address icon_confused.gif
IOCDS was different from IODF and it worked icon_exclaim.gif
These things was different from IBM manual. Do you think any problems may occur ? icon_question.gif
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Robert Sample

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PostPosted: Sun Mar 26, 2017 7:07 pm    Post subject:
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The SE knows more about the console and the system definitions. If the SE set it up, then I doubt any problems will occur. If they could occur, the SE would have told the system programmer(s) what to do about them.
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