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  • 1.  reduce Minimum CPU online

    Posted Mon March 27, 2023 09:15 AM

    Hello

    is there any way to reduce minimum CPU value online using HMC for current profile  ??



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    Naser alkhawaldeh
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  • 2.  RE: reduce Minimum CPU online

    Posted Tue March 28, 2023 09:26 AM

    It depends if you are sharing the CPU or not and what is your min, desire and max CPU settings. It may need a reboot of lpar.  If you have support contract open a case with support.






  • 3.  RE: reduce Minimum CPU online

    Posted Wed March 29, 2023 01:53 PM
    Edited by Zaki Jääskeläinen Wed March 29, 2023 02:04 PM

    Reboot = shutdown and activate LPAR. A plain reboot will not reload the LPAR profile.

    Also to be careful when editing LPAR profiles: watch out for automatic saving of configuration changes to profile getting disabled. I have had multiple customers running into problems with this. They don't realise dynamic changes no longer getting saved because someone used the Manage Profiles function in the HMC GUI. At next downtime LPARs coming up with missing resources, for example virtual FC slots or virtual SCSI disks missing. Especially annoying when virtual FC slots gets lost as recreating them requires redoing SAN switch zoning and host definitions for LUN mapping. Even worse when this happens with a VIO server. I have posted an IDEA (currently under review; only two votes so far so I doubt it will get approved by IBM) to keep a persistent warning in the HMC GUI when you are working on an LPAR and changes no longer are saved.



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    Zaki Jääskeläinen
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  • 4.  RE: reduce Minimum CPU online

    Posted Thu March 30, 2023 03:26 AM

    > Reboot = shutdown and activate LPAR. A plain reboot will not reload the LPAR profile.

    Be sure to specify profile when activating the LPAR. If you do not, LPAR will be activated using the current (ie last active) config values.



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    Lech Szychowski
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  • 5.  RE: reduce Minimum CPU online

    Posted Thu March 30, 2023 03:40 AM

    If configuration changes are saved automatically then you should not need to select the profile.

    If not then this defeats the new style of DLPAR operations in the enhanced HMC GUI and all work must be done using the Manage Profiles and downtime is therefore require for any change.



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    Zaki Jääskeläinen
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