Is it possible to use an NVME drive to cache a RAID array

So I set up the RAID6 with spinning rust, and wanted to have writes go to the NVME as a cache with write-back to the RAID. I don’t see how to do that :frowning: Any help gratefully accepted.

Edit: is it even possible ? I don’t see CONFIG_BCACHE / CONFIG_DM_CACHE / CONFIG_DM_WRITECACHE enabled ?

If its not possible now, is it on the roadmap ?

ZimaOS has no support for flash drive caching yet.