Software Raid 5

mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/hdb /dev/hdc /dev/hdd
 * To create the RAID

mdadm --assemble /dev/md0 /dev/hdb /dev/hdc /dev/hdd
 * To rebuild the RAID

cat /proc/mdstat
 * Status of the RAID

mdadm --query --examine /dev/hdb /dev/hdc /dev/hdd
 * Status of the Drives