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Appendix A: The Bottom Line > Chapter 12: Balancing Resource Utilization

Chapter 12: Balancing Resource Utilization

Configure and execute vMotion. vMotion is a feature that allows running VMs to be migrated from one physical ESXi host to another physical ESXi host with no downtime to end users. To execute vMotion, both the ESXi hosts and the VMs must meet specific configuration requirements. In addition, vCenter Server performs validation checks to ensure that vMotion compatibility rules are observed.

Master It A certain vendor has just released a series of patches for some of the guest OSes in your virtualized infrastructure. You request an outage window from your supervisor, but your supervisor says to just use vMotion to prevent downtime. Is your supervisor correct? Why or why not?

Solution Your supervisor is incorrect. vMotion can be used to move running VMs from one physical host to another, but it does not address outages within a guest OS because of reboots or other malfunctions. If you had been requesting an outage window to apply updates to the host, the supervisor would have been correct — you could use vMotion to move all the VMs to other hosts within the environment and then patch the first host. There would be no end-user downtime in that situation.


  

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