Looks good. I don't mind the overhead. That seems to be much more resilient compared to RAID5/6 and its ZFS equivalents and addresses all the concerns I outlined in this comment:
I'm still somewhat alarmed by the possibility of the surviving mirror drive failing during resilver and destroying the pool... Are there any failure chance calculators for this pool of mirrors topology? No doubt it's much lower than the RAID5/6 setups but still.
Is this topology usable in btrfs without the famous reliability issues? How good is ZFS support is on Linux? I'm a Linux guy so I'd really like to keep using Linux if possible. Maybe Linux LVM/mdadm?
https://news.ycombinator.com/item?id=39068493
I'm still somewhat alarmed by the possibility of the surviving mirror drive failing during resilver and destroying the pool... Are there any failure chance calculators for this pool of mirrors topology? No doubt it's much lower than the RAID5/6 setups but still.
Is this topology usable in btrfs without the famous reliability issues? How good is ZFS support is on Linux? I'm a Linux guy so I'd really like to keep using Linux if possible. Maybe Linux LVM/mdadm?