# create a small raid6 array, make it larger. Then make it smaller
-mdadm -CR $md0 -e 0.90 --level raid6 --chunk=32 --raid-disks 4 --size $[size/2] $dev1 $dev2 $dev3 $dev4
+mdadm -CR $md0 -e 0.90 --level raid6 --chunk=64 --raid-disks 4 --size $[size/2] $dev1 $dev2 $dev3 $dev4
check wait
check state UUUU
testdev $md0 2 $[size/2] 32