SSD Caching software solution

Hello,

There is seems more and more stable solution for SSD caching without hardware raid card.

I'm need SSD caching for RAW partitions (Windows) is there any of there SSD caching that's could work with RAW instead of filesystem ?

ZFS have interresting features too, but seems also work only with his filesystem ? (never test it just look at man and some webpage)

The goal is to have SSD caching with Software Raid and RAW partition for Windows VM guest host.

Thanks