Replication setup for SC8000 to SCv2020

We recently received new SCv2020 and it is been installed and configured to use. However, the volumes from the existing SC8000 need to be migrated to SCv2020.

I heard of one time volume replication is possible from SC8000 to SCv2020. Can anybody shed more light on this and help us to configure the same.

Both storages are on iSCSI setup.