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# create a simple raid4 set mdadm -CfR $md0 -l 4 -n3 $dev0 $dev1 $dev2 check resync ; check raid5 testdev $md0 2 $mdsize0 64 mdadm -S $md0 # now with version-1 superblock mdadm -CR $md0 -e1 --level=raid4 -n4 $dev0 $dev1 $dev2 $dev3 check resync; check raid5 testdev $md0 3 $mdsize1 64 mdadm -S $md0 exit 0