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  • 1.  Can Simplified Remote Restart by 2 HMC servers?

    Posted Wed November 10, 2021 05:29 AM
    Will it be possible to use Simplified Remote Restart over 2 HMC servers?

    Scenario:
    LPAR-A runs on S924A which is managed by HMC1. HMC1 only manages S924A. I have another server S924B which is managed by HMC2. HMC2 manages S924B only. 

    Is it possible to perform Simplified Remote Restart for LPAR-A from/to S924A / S924B?

    There is network limitation HMC2 cannot manage S924A.

    Thank you.

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    Ivan NG
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  • 2.  RE: Can Simplified Remote Restart by 2 HMC servers?

    Posted Thu November 11, 2021 06:34 AM
    Hi Ivan!
    Using the rrstartlpar command on HMC CLI you can initiate a remote HMC connection (option --ip and -u ) to resolve your goal!
    But in case of a complete data center crash including lost of HMC1 the will be no chance to do a SRR action ...
    Regards
    Peter

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    Peter Hornung
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    Original Message


  • 3.  RE: Can Simplified Remote Restart by 2 HMC servers?

    Posted Fri November 12, 2021 06:16 AM

    Hi, 
    since a whiule SRR was enhanced that also the mkauthkeys SSH authentication can be used to perform the operation between two different HMCs.
    So source System in managed by HMC1 and target System is managed by HMC2.
    There is some Info about that in this Document:
    https://community.ibm.com/HigherLogic/System/DownloadDocumentFile.ashx?DocumentFileKey=7c7b05d4-0342-6338-537e-aaaf5674cea4

    So just like for LPM with two different HMCs, the rrstartlpar command can be used. Example:

    mkauthkeys –-ip <target hmc ip/host name> -u <target hmc user name> --passwd <password>
    rrstartlpar –o validate –m <source system> -t <target system> -p <partition name> | --id <partition id> --ip <target hmc ip/host name> [-u target hmc user name]

    As usual:
    As long as the LPM validation is successfull, the SRR validation / operation should also be successfull.
    When the Source System / LPAR is still up and running SRR validation will usually provide HSCL messages with Info ,that Validation could not be fully performed, because the LPAR / System is still up and running but that is only informational.

    When the Target System can not provide the exact same Networks / SAN connections LPM / SRR might fail. Some override flags might be used to still make the operation successfull, but the LPAR might not be able to access the targets it should acces. SRR is not a HA solution !!

    Hope that helps.
    Greetings
    Marc-Eric



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    Marc-Eric Kahle
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    Original Message


  • 4.  RE: Can Simplified Remote Restart by 2 HMC servers?

    Posted Thu November 18, 2021 07:14 PM
    Thanks Peter and Eric. Tried the rrstartlpar with "--ip " option works perfectly.
    FYI, our environment plans to have 1st HMC manages 1st group of Power Systems and 2nd HMC manages 2nd group of Power Systems. We may leverage Simplified Remote Restart (SimRR) to restart LPARs on other group of Power Systems. 

    Thank you. 

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    Ivan NG
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    Original Message