The same MTC z-stream version must be installed on the source and target clusters.
Download and re-install the MTC Operator on the OpenShift 3 cluster just before you run a migration to ensure that you have the latest version.
The Operator Lifecycle Manager (OLM) pushes MTC Operator updates to the OpenShift 4 cluster automatically. On the OpenShift 3 cluster, however, the MTC Operator is installed manually and is not updated automatically.
In the web console, check the ‘OLM Managed' setting in the ‘MigrationController' manifest of each cluster:
Migrate a simple application without a persistent volume (PV):
Migrate an application with a PV:
If you are performing multiple test migrations, remove the migrated application namespace from the target cluster after each test.