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  • 1.  Failed Esxi

    Posted Mar 21, 2024 07:12 AM

    Hello,

    If there are an esxi host failure, will the VM guest restarted before the guest migrate to other esxi host?



  • 2.  RE: Failed Esxi

    Posted Mar 21, 2024 07:19 AM

    Hi,

    Assuming you have enabled  HA on your cluster and it is configured correctly, your VMs will be restarted on another host in the cluster.

    Your guests will experience an unplanned shutdown, but there's no way to work around that. I mean, you could start using FT, but that is not an option for all of your VMs.



  • 3.  RE: Failed Esxi

    Posted Mar 21, 2024 07:34 AM

    so vm reboot is needed? Can we avoid this?



  • 4.  RE: Failed Esxi

    Posted Mar 21, 2024 07:36 AM

    The only way to avoid that would be to use fault tolerance, but that does not scale to all the VMs in your cluster and has caveats that need to be taken into account.

    It makes sense that all guest VMs experience a reboot, the underlying hardware experienced an issue so it's the same if your server is running virtual or physical



  • 5.  RE: Failed Esxi

    Posted Mar 21, 2024 09:45 AM

     - It isn't reall a "reboot". If an ESXi host fails unexpectedly, the VMs running on it will all fail unexpectedly too. What vSphere HA does then, is detect the failure, and "restarts" those VMs on other hosts.

     

    The key thing here is the host failure is unexpected, so you can't prevent the VMs failing as well UNLESS as  suggests, you enable the Fault Tolerance feature on VMs that require higher levels of protection. This should be done on a per VM basis though, not for all VMs on the Cluster. For more info, see link

    https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.avail.doc/GUID-02E5849B-6B02-453E-ABCA-ACAE7E731DBC.html

     

    Also be aware of limits and licensing

     

    HTH