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Actually, it appears the raid6 does work. Only affects 4 and 5.
[root@host-121 ~]# lvcreate -L 100M --type raid6 -i 3 VG
Using default stripesize 64.00 KiB.
Rounding size 100.00 MiB (25 extents) up to stripe boundary size 108.00 MiB(27 extents).
Logical volume "lvol0" created.
[root@host-121 ~]# lvconvert --yes --stripes 4 VG/lvol0
Using default stripesize 64.00 KiB.
WARNING: Adding stripes to active logical volume VG/lvol0 will grow it from 27 to 36 extents!
Run "lvresize -l27 VG/lvol0" to shrink it or use the additional capacity.
Logical volume VG/lvol0 successfully converted.