I can't claim this as mine, I feature requested from my OS, and was emailed this solution. I wanted a JBOD cache pool, as this would best leverage my upgrades and I don't need the protection of new btrfs-raid. Been running for two months, so far so good, figured I should share the knowledge.   Instructions:   0.)     Backup any data you don't want to lose. These steps will format your cache drive(s). You have been warned. ((appdata, DOMAINS, system?))   1.a)   If yo