RHEV VM migration fails with "Returning backwards compatible migration error code"

Solution In Progress - Updated -


  • VM migrations were failing without providing any meaningful error.

  • The Event Log in the RHEV Admin Portal showed;

Failed to migrate VM abc to Host xyz. Trying to migrate to another Host
  • The vdsm logs on the source host showed;
Thread-12509491::ERROR::2016-12-22 09:49:56,307::migration::252::virt.vm::(_recover) vmId=`36710f55-4f25-4c80-912e-d7c9dfc87b99`::migration destination error: Fatal error during migration
  • The vdsm logs on the destination host showed;
jsonrpc.Executor/0::DEBUG::2016-12-22 09:49:56,304::API::601::vds::(migrationCreate) Migration create - Failed
jsonrpc.Executor/0::DEBUG::2016-12-22 09:49:56,305::API::607::vds::(migrationCreate) Returning backwards compatible migration error code
  • A side-effect of this is that a host can go into an ERROR state if more than a pre-defined number of these occur within a set period of time. Please refer to the following KBase article for more information.


  • Red Hat Virtualization (RHV) 4.0 (prior to 4.0.7)
  • Red Hat Enterprise Linux (RHEL) 7.3, 7.4 hosts;
    • vdsm-4.18.x-y
    • vdsm-4.19.x-y

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