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# Understanding Open Replicator

Open Replicator is a non-disruptive migration and data mobility application.

When the Open Replicator control volumes are on a storage system running HYPERMAX OS 5977 or higher, the following session options cannot be used:

- Push
- Differential
- Precopy

There are many rules and limitations for running Open Replicator sessions. Refer to the Solutions Enabler Migration CLI Product Guide before creating a session. For a quick reference, see Open Replicator session options.