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I would just skip RAID, add all disk to a single BTRFS and use the built in profiles for (meta)data redundancy.
Cache I don't know much tho.
https://btrfs.readthedocs.io/en/latest/btrfs-device.html
Are there some advantages of btrfs over raid? I understand how raid works but btrfs for redundancy is foreign to me.
I use BTRFS for snapshots, and auto compression. Maybe it can be done with raids with LVM? AFAIK BTRFS redundancy is basically the same as traditional RAID, similar to using mdadm. Still, you would want a backup strat instead relying on the disk redundancy. I learn that the hardway.