Hello DavidQY,

Here is a white paper that explains about the different Migrations Technologies.  If you look on pages 8-16 it explains a little more about migration solutions block. https://www.emc.com/collateral/white-papers/h15163-dell-emc-unity-migration-technologies.pdf

Here is also the link to other technical documents & videos. https://www.dell.com/support/article/us/en/04/sln310140/dell-emc-unity-technical-documents-and-videos?lang=en

Please let us know if you have any other questions.

Thank you for the link. however none of them mentions clustered environment.

And the youtube Unity block import video has been removed.