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Setting up RAID-5

RAID-5 (and RAID-4) are set up just like RAID-1. Here is /etc/raidtab:
raiddev /dev/md0
raid-level 5
nr-raid-disks 4
nr-spare-disks 0
persistent-superblock 1
chunk-size 32
device /dev/sda1
raid-disk 0
device /dev/sdb1
raid-disk 1
device /dev/sdc1
raid-disk 2
device /dev/sdd1
raid-disk 3
RAID-5 also reconstructs its parity data in background.