I have done RAID5 with this mobo before - and note this is Linux md RAID
not mobo fake raid
/boot is XFS on top of its own RAID1 (small partition on both drives)
/boot/efi is vfat on top of its own RAID1 (ditto)
The rest of the drive is a large partition on each drive with RAID1, then
LVM, then my other partitions which are all xfs except for of course swap
I will try the other drive to see what happens
product: F2A55M-HD2
vendor: Gigabyte Technology Co., Ltd.