Tell the system that my disks will be raided:
Correct autoraid:
/sbin/fdisk /dev/sdd1 p t fd w
do this for each disk:
/sbin/mdadm --create --verbose --raid-devices=3 --level=5 /dev/md0 /dev/sdd1 /dev/sde1 /dev/sdf1 /sbin/mdadm --detail --scan > /etc/mdadm.conf
# Check
/sbin/mdadm --detail /dev/md0
/sbin/mkfs.ext3 /dev/md0 mount /dev/md0 /dataxrd
Correct fstab:
/dev/md0 /dataxrd ext3 defaults 0 0
Make RAID5 from existing disks (which were in RAID5 before)
/sbin/mdadm -A /dev/md0 /dev/sdd1 /dev/sde1 /dev/sdf1 /sbin/mdadm --detail --scan > /etc/mdadm.conf