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TokuMX was forked from 2.2.4, but we have and will continue to add features from 2.4. For instance, hash based sharding is in TokuMX.

One cannot mix a replica set with TokuMX and MongoDB.

Could I start a TokuMX replica to get the data across then shut off the master and switch to using it?

We have a very large install and migrating the data on production systems would be very difficult otherwise.

Unfortunately not, the replication format is completely different. A tool to do this would not be difficult to write, though.