Answer Posted / rajalakshmy

You should use the following Command
# mdadm -C /dev/md0 -l 5 -n 3 /dev/sda{1,2,3}


raiddev /dev/md0
raid-level 5
nr-raid-disks 3
nr-spare-disks 0
persistent-superblock 1
parity-algorithm left-symmetric
chunk-size 32
device /dev/sdb2

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