tests/19repair-does-not-destroy

   1 number_of_disks=7
   2 chunksize_in_kib=512
   3 array_data_size_in_kib=$[chunksize_in_kib*(number_of_disks-2)*number_of_disks]
   4 array_data_size_in_b=$[array_data_size_in_kib*1024]
   5 devs="$dev0 $dev1 $dev2 $dev3 $dev4 $dev5 $dev6"
   6
   7 dd if=/dev/urandom of=/tmp/RandFile bs=1024 count=$array_data_size_in_kib
   8 mdadm -CR $md0 -l6 -n$number_of_disks -c $chunksize_in_kib $devs
   9 dd if=/tmp/RandFile of=$md0 bs=1024 count=$array_data_size_in_kib
  10 blockdev --flushbufs $md0; sync
  11 check wait
  12 blockdev --flushbufs $devs; sync
  13 echo 3 > /proc/sys/vm/drop_caches
  14 $dir/raid6check $md0 repair  1 2 3 > /dev/null # D D
  15 $dir/raid6check $md0 repair  8 2 5 > /dev/null # D P
  16 $dir/raid6check $md0 repair 15 4 6 > /dev/null # D Q
  17 $dir/raid6check $md0 repair 22 5 6 > /dev/null # P Q
  18 $dir/raid6check $md0 repair  3 4 0 > /dev/null # Q D
  19 $dir/raid6check $md0 repair  3 3 1 > /dev/null # P D
  20 $dir/raid6check $md0 repair  6 4 5 > /dev/null # D<D
  21 $dir/raid6check $md0 repair 13 5 4 > /dev/null # D>D
  22 blockdev --flushbufs $devs; sync
  23 echo 3 > /proc/sys/vm/drop_caches
  24 $dir/raid6check $md0 0 0 2>&1 | grep -qs "Error" && { echo errors detected; exit 2; }
  25 cmp -s -n $array_data_size_in_b $md0 /tmp/RandFile || { echo should not mess up correct stripe ; exit 2; }
  26
  27 mdadm -S $md0
  28 udevadm settle
  29 blockdev --flushbufs $md0 $devs; sync