Comment by saltcured

Yeah, when I used it on a workstation many years ago, I layered it on top of an MD RAID-1 SSD array for the cache and an MD RAID-5 HDD array for the bulk store.

I used writeback mode, but expected to wipe the machine if the caching layer ever collapsed. In the end, the SSDs outlived my interest in the machine, though I think I did failover an HDD or two while the rest remained in normal operating mode.