Lpar deletion from IODF

[Steve Lee]

Dear,

Using HCD, there is a need to remove a Lpar(Partition) definition from a CEC.
As we know much on it, I removed a lpar from the Processor definition which is followed into Processor ID>CSS ID>6. Work with partition.
Selected the Lpar and deleted with a Work IODF, and ready to build a Production IODF.

With this process, it is pretty quite simple and straight forward removing the lpar. I however, make sure of a few others that I am a bit concerned below:

1. may lose any of connection from other existing lpars
2. may have any messages from consoles on other existing lpars
3. may have some stuff to do with Sysplex coupled with two CECs, and CF01, 02 in each CEC
4. may have an issue when dynamic refresh with this Lpar removal IODF over all lpars in the CEC in implementing "Activate S/W, and H/W configuration
5. anything that I am not aware of


Any input from youall will greatly be appreciated, let me know if any further information needed. Thanks huge in advance!!


Steve

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[Feller, Paul]

Steve, the answer depends on what your environment is like.

Is this lpar part of a JES MAS? Are there changes needed in any JES exits?
Can jobs be routed to it from other lpars?
Is there any automation in place that might route commands to the lpar?
Do you need to adjust the weights of the remaining lpars to better use the CEC?
Do you want to take what memory was assigned to the lpar and add it to one or more of the other lpars on the CEC?

I’ve added and deleted an lpar dynamically without any issues. This was on a z13 or newer CEC and z/OS 2.x or new operating system.


Thanks..

Paul Feller
GTS Mainframe Technical Support

_____________________________________________
From: IBM Mainframe Discussion List <IBM-***@LISTSERV.UA.EDU> On Behalf Of Steve Lee
Sent: Friday, January 22, 2021 11:28 AM
To: IBM-***@LISTSERV.UA.EDU
Subject: Lpar deletion from IODF [EXTERNAL]


Dear,

Using HCD, there is a need to remove a Lpar(Partition) definition from a CEC.
As we know much on it, I removed a lpar from the Processor definition which is followed into Processor ID>CSS ID>6. Work with partition.
Selected the Lpar and deleted with a Work IODF, and ready to build a Production IODF.

With this process, it is pretty quite simple and straight forward removing the lpar. I however, make sure of a few others that I am a bit concerned below:

1. may lose any of connection from other existing lpars
2. may have any messages from consoles on other existing lpars
3. may have some stuff to do with Sysplex coupled with two CECs, and CF01, 02 in each CEC
4. may have an issue when dynamic refresh with this Lpar removal IODF over all lpars in the CEC in implementing "Activate S/W, and H/W configuration
5. anything that I am not aware of


Any input from youall will greatly be appreciated, let me know if any further information needed. Thanks huge in advance!!


Steve

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[Steve Lee]

Hi Paul,

Sorry for the late getting back to this List. Let me get you some of those at this moment. Will get you all later this week.

1) there is JES MAS in that CEC sharing 5 lpars but no change needed in JES Exits at this moment
2) We will stop auto routing commands to removing lpar(s)
3) yes we will readjust the Weight numbers anytime after removed those numbers from HMC dynamically refresh mode
4) please confirm me that we will absolutely take out memories and add them to other lpars
- in this case, 1) take out init/reserved memory from Image profile and save from HMC
2) deactivate the removing lpar from HMC
3) POR needed to completely release the memory from the CEC? Sure we need to do POR
4) reassign those memories as needed to other lpars and deactivate/activate the Lpars taking advantage?
5) after building the Production IODF, will dynamically refresh all S/W activation, and H/W activation from remaining lpars
and change IOCDS for next future POR, anything I might miss and something you encountered?


All input would be appreciated!!

Steve

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