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SVC IP Quorum mode for Stretched , dual site topology

  • 1.  SVC IP Quorum mode for Stretched , dual site topology

    Posted Fri March 25, 2022 01:54 PM
    Dear Team

    We have a SVC Enhanced stretched cluster across 2 sites ( Site 1 & Site 2 ) with the below settings .,

    svc : 8.3.1.6

    topology stretched
    topology_status dual_site



    We have 3 IP Quorum Devices . 2 in Site1 and 1 in Site 2

    Current Quorum settings are as below

    quorum_mode standard
    quorum_site_id
    quorum_site_name
    quorum_lease long


    We would like to ensure that during a cross site link failure or split brain scenario , SVC is online in Site 1 as much as possible
    For this , what should we set the below Quorum settings to ?


    quorum_mode : Preferred or Winner ( Also what is the difference between Quorum mode Preferred & winner ? ) 
    quorum_site_id
    quorumlease

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    ANAND GOPINATH
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  • 2.  RE: SVC IP Quorum mode for Stretched , dual site topology

    Posted Mon March 28, 2022 11:56 AM
    Have a look at : https://www.ibm.com/docs/en/flashsystem-7x00/8.3.x?topic=cd-configuring-quorum

    Part of text: 
    When you are using an IP quorum application at a third site, you can configure a preference for which site continues operation if there is a loss of connectivity between the two sites. If only one site runs critical applications, you can configure this site as preferred. If a preferred site is configured and a failure causes an outage at the preferred site, the other site wins the tie-break and continues operating and processing I/O requests.

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    T Masteen
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