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    How to Patch a TWO-NODE VCS Cluster ?

    How to Patch a TWO-NODE Cluster ? Explain PATCHING steps .


    To patch a two node VCS cluster, please Follow this procedure ,

    ** 1. "Node A".
    Download patches.
    ** 2. "Node B"
    Failover all services to "Node B".
    Make sure all service groups are frozen and non-critical.
    # hastop –local -force (On Node A)
    # hasys -freeze <SystemName>

    ** 3. "Node A"
    VCS should already be down on "A"
    Copy /etc/llttab /etc/llthosts /etc/gabtab files to .SAV files and make a
    backup.
    Unencaplulate root drives and break the root mirror. ( detach the mirror incase of rollback)
    Load patches and reboot.
    # hastatus sum
    ** 4. "Node B"
    # hastatus sum

    Unfreeze services on "B"
    # hasys -unfreeze <SystemName>

    ** 5. "Node B"
    Failover the services one at a time (review dependencies) to "Node A"
    Verify all services are down on "Node B" and running on "Node A"
    Make sure all service groups are frozen and non-critical.
    # hastop –local -force (On Node B)# hasys -freeze <SystemName>

    ** 6. "Node B"
    Repeat the upgrade process on "Node B".
    UnEncapsulate root drives and break the root mirror. ( detach the mirror incase of rollback )
    Load patches and reboot.
    Reboot
    # hastatus -sum

    FYI :- 


     A) hastop is not required at any point. However, before rebooting any
    server, make sure that your VCS configuration files, primarily main.cf
    is closed else your cluster might go into a stale state.

    B) In your proposed method, the 1st outage will be required when you
    failover the running services to Node B to be able to patch Node A. The
    second outage will be required when you have to failover the running
    services to Node A to be able to patch Node B.

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