Documentation of PerconaFT storage engine?

Can somebody tell me where to find the documentation of the PerconaFT storage engine? And maybe some hints for settings according to performance?

Cheers, Tom

PS: I know the engine is deprecated but as we migrate from TokuMX 2.0.2 to PerconaServer for Mongo I didn’t want to change to much.

Hello Tom, here is the PerconaFT Storage Engine for PSMDB 3.0 and 3.2