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  • 1.  Enhanced Stretched Cluster

    Posted 14 hours ago
    Edited by Bacil123 10 hours ago

    Hello Team.
    We have a fully functional IBM SVC3 2145 Enhanced Stretched Cluster spanning two sites (10km apart). IBM Flash systems (FS7300) are behind SVCs. SVC Quorum (IP) is in a 3rd site in Public Cloud. A year or more back hardware was also refreshed.
    Is it possible to convert the current setup to largely new superseded PBHA (Policy Based High Availability) Solution. Is there a IBM supported way to do that, or that would involve a huge hardware/software infra change.
    What we need to consider if we want to go for a PBHA.  Thanks in advance.



  • 2.  RE: Enhanced Stretched Cluster

    Posted 10 hours ago

    Hi 

    There is an IBM Redbook about PB-HA which contains the migration method from Hyperswap to PB-HA. You can read it, but it does not cover the migration of Enhanced Stretch Clusters to PB-HA. However, the idea is almost the same and simple.
    https://www.redbooks.ibm.com/abstracts/sg248569.html

     
    1. Unmirror HA-volumes
    Convert all HyperSwap volumes to basic volumes and leave a volume copy on only the remaining enclosure (IO-group).
    2. Migrate non-HA-volumes
    Migrate all non-HA volumes to the remaining enclosure (IO-group).
    3. Unconfigure HyperSwap
    Change topology to standard.
    4. Remove enclosure
    If IO-group 0 is the remaining enclosure, then remove the nodes from I/O group 1. The nodes in IO-group 1 change to state Candidate.
    5. Initialize a new system
    Create a new system by using the nodes from I/O group 1.
    6. Configure policy-based HA


    ------------------------------
    Nezih Boyacioglu
    IBM Community Hero
    https://nezihboyacioglu.com
    ------------------------------



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