Warm Migrating VMs from RHV fails due to following error
Unable to connect to imageio data source: Sending request failed

Following error is reported in the forklift-controller
Fault reason is \"Operation Failed\". Fault detail is \"[Cannot remove Snapshot. The VM is performing an operation on a Snapshot. Please wait for the operation to finish, and try again.]\". HTTP response code is \"409\". HTTP response message is \"409 Conflict\{code}

Version-Release number of selected component (if applicable):
MTV 2.7.9

2 customers reported the same error

1. Start Warm VM migration from RHV 
2. Migration fails on CopyDisks with Unable to connect to imageio data

RHV VM migration fails after updating MTV from 2.5 to 2.7.9

~~~
Error:
        phase: CopyDisks
        reasons:
        - 'Unable to connect to imageio data source: Sending request failed: Get "xxxxxx:54322/images/c8a15907-73f8-4f45-a63e-44f6311185e5":
          Unknown Code'

message: 'Unable to connect to imageio data source: Error sending transfer image
      request: Fault reason is "Operation Failed". Fault detail is "[Cannot transfer
      Virtual Disk. The disk ocp_test_vm_disk is plugged to non-Down VMs: ocp-test-vm]".
      HTTP response code is "409". HTTP response message is "409 Conflict".'
    reason: Error
~~~

Looking at the RHV engine.log it fails here
~~~
2025-01-28 16:18:03,822+01 WARN  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotCommand] (default task-544730) [068d61ec_finalize] Validation of action 'RemoveSnapshot' failed for user admin@internal-authz. Reasons: VAR__TYPE__SNAPSHOT,VAR__ACTION__REMOVE,ACTION_TYPE_FAILED_VM_IS_DURING_SNAPSHOT
2025-01-28 16:18:03,822+01 INFO  [org.ovirt.engine.core.bll.snapshots.RemoveSnapshotCommand] (default task-544730) [068d61ec_finalize] Lock freed to object 'EngineLock:{exclusiveLocks='[56320177-6198-43bb-b1ef-8825ec2b1edd=VM]', sharedLocks=''}'
2025-01-28 16:18:03,826+01 ERROR [org.ovirt.engine.api.restapi.resource.AbstractBackendResource] (default task-544730) [] Operation Failed: [Cannot remove Snapshot. The VM is performing an operation on a Snapshot. Please wait for the operation to finish, and try again.]       <<<<

Image transfer fails because VM is not down:

2025-01-28 16:18:28,175+01 INFO  [org.ovirt.engine.core.bll.storage.disk.image.TransferDiskImageCommand] (default task-544730) [97d84dea-5177-4dfe-b816-722a9d956c95] Lock Acquired to object 'EngineLock:{exclusiveLocks='[f00fe8ba-56e7-4a95-acb9-3a96c6f2cc4f=DISK]', sharedLocks='[]'}'
2025-01-28 16:18:28,238+01 WARN  [org.ovirt.engine.core.bll.storage.disk.image.TransferDiskImageCommand] (default task-544730) [97d84dea-5177-4dfe-b816-722a9d956c95] Validation of action 'TransferDiskImage' failed for user admin@internal-authz. Reasons: VAR__TYPE__DISK,VAR__ACTION__TRANSFER,ACTION_TYPE_FAILED_DISK_PLUGGED_TO_NON_DOWN_VMS,$DiskName ocp_test_vm_disk,$VmList ocp-test-vm
~~~