I'm investigating using LVMRAID instead of MD+LVM. In my case, I'm looking at a RAID6.
As expected, the docs say you need N+1 devices for RAID5, and a minimum of 3 drives.
The docs say for RAID 6 you need N+2.
However, it then says that the minimum drives required is 5.
In an MD RAID6, only 4 drives are required. So if I built RAID6+LVM I'd only need 4 drives whereas, according to the docs, I'd need 5 drives for LVMRAID6.
Does LVMRAID6 really need 5 drives?
If so, why does it need 5 drives rather than MDRAID6's 4 drives?