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PowerHA 7.2.8 Network Down Failover Problem

  • 1.  PowerHA 7.2.8 Network Down Failover Problem

    Posted Tue September 10, 2024 12:23 AM

    PowerHA 7.2.8 Network Down Failover Problem

    *Build environment #1 (Result: Abnormal operation)

    AIX 7.3 TL02
    PowerHA 7.2.8.2

    STARTUP="OHN"
    FALLOVER="FNPN"
    FALLBACK="NFB"

    # PowerHA Test Scenario


    1. Node A's network down: Failover to Node B (normal)
    2. Node A's network recovery: Node A network recovery message (normal), Node B RG online
    3. Node B's network down: No response after Node B network down message
    4. Halt of Node B (in the above state): Failover to Node A (normal)


    *Build environment #2 (Result: normal operation)

    AIX 7.3 TL02
    PowerHA 7.2.7.0

    STARTUP="OHN"
    FALLOVER="FNPN"
    FALLBACK="NFB"


    1. Node A's network down: Failover to Node B (normal)
    2. Node A's network recovery: Node A network recovery message (normal), Node B RG online
    3. Node B's network goes down: Node B network goes down and then fails over to Node A (normal)


    Just in case, the same thing happens if you change the Fallback Policy to Fallback To Higher Priority Node In The List.

    In 7.2.7, it works normally in case of network failure.

    However, in 7.2.8, it operates abnormally in case of network failure.


    I suspect it is a bug in 7.2.8.
    Has anyone experienced a similar case?



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    승원 이
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  • 2.  RE: PowerHA 7.2.8 Network Down Failover Problem

    Posted Wed September 11, 2024 01:58 PM

    In my experience, this is due to network devices such as LAN routers and the gratuitous IP packet being sent from the new HA node, which the router ignores to update its ARP table.

    After a switchover, the service IP address is passed from one node to the other, but without a proper ARP update, the router thinks that the service IP address still has the old MAC address.

     

    Regards

     

    Luis A. Rojas Kramer

    TFI Mexico – Grupo Integrador de Productos y Soluciones de TI.

     

     




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