We did a migration from a EMC 8830 to a EMC DMX-3 using TDMF and it went very smoothly. Although you cannot go 3 to 1, you can go 1 to 1 then disable 1/3 of the volumes and use DFDSS to move whatever you can. You can then move the rest during your maintenance window, if you have one. The one thing I liked about TDMF was that it would resize your VTOC for you.
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