Live Migration Failure With Error: "The instance requires a newer hypervisor version than has been provided."

Problem

Nova Conductor Debug logs
    
 
2024-10-02 19:51:45.109 7549 DEBUG nova.conductor.tasks.live_migrate [req-bfd4fa06-9205-443e-b80e-0b0062ae8d3b aa3ada4a824f4f87be8d23a8138b9751 0b81ca966e6447829b8c0181c237d96d - default default] Skipping host: 7faf9b59-9ad9-4916-8332-15fb703459b8 because: The instance requires a newer hypervisor version than has been provided. _find_destination /opt/pf9/nova/lib/python3.9/site-packages/nova/conductor/tasks/live_migrate.py:560
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Environment

Platform9 Managed OpenStack - All versions

Answer

This is an expected behaviour with Nova. By default, a live migration from higher libvirt/qemu versions to lower versions is not supported.
Nova has the following codes to check hypervisor compatibility.

Nova Code
    
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---- conductor/tasks/live_migrate.py ----def _check_compatible_with_source_hypervisor(self, destination):source_info = self._get_compute_info(self.source)destination_info = self._get_compute_info(destination) source_type = source_info['hypervisor_type']destination_type = destination_info['hypervisor_type']if source_type != destination_type:raise exception.InvalidHypervisorType() source_version = source_info['hypervisor_version']destination_version = destination_info['hypervisor_version']if source_version > destination_version:raise exception.DestinationHypervisorTooOld()
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Additional Information

Refer to a similar issue reported by RedHat: https://access.redhat.com/solutions/3587091

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