3 # create a raid5, fail and remove a drive during initial sync
4 # Add two more, fail and remove one
5 # wait for sync to complete, fail, remove, re-add
7 mdadm -CR $md0 -l5 -n4 $dev0 $dev1 $dev2 $dev3
9 mdadm $md0 --fail $dev3
14 mdadm $md0 --add $dev4 $dev5
17 mdadm $md0 --fail $dev0
18 mdadm $md0 --remove $dev3 $dev0