Impressive answer! What do you understand by orphaned Virtual Machine (VM)? This is your best answer... During the vSphere HA fail-over when one host is failed, VM start migrating to other host and restart it. But sometime it fails to register itself to other host during fail-over and become orphaned. The interviewer expectation is that you will highlight why the VM became orphaned and describe some reasons.
Whoever is asking will be impressed if you also mention... In vCenter Server, an "orphaned" virtual machine is one that exists in the vCenter Server database but is no longer present in ESXi host inventory. Moreover, an "invalid" virtual machine is a VM that is inaccessible because the ESXi host is offline or inaccessible, the VM configuration file is locked or corrupt or contains a bad option, or other possible causes.
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