tests/19raid6repair

   1 number_of_disks=4
   2 chunksize_in_kib=512
   3 chunksize_in_b=$[chunksize_in_kib*1024]
   4 array_data_size_in_kib=$[chunksize_in_kib*(number_of_disks-2)*number_of_disks]
   5 array_data_size_in_b=$[array_data_size_in_kib*1024]
   6 devs="$dev1 $dev2 $dev3 $dev4"
   7
   8 # default 2048 sectors
   9 data_offset_in_kib=$[2048/2]
  10
  11 for failure in "$dev3 3 3 2" "$dev3 3 2 3" "$dev3 3 2 1" "$dev3 3 2 0" "$dev4 3 3 0" "$dev4 3 3 1" "$dev4 3 3 2" \
  12                 "$dev1 3 0 1" "$dev1 3 0 2" "$dev1 3 0 3" "$dev2 3 1 0" "$dev2 3 1 2" "$dev2 3 1 3" ; do
  13         failure_split=( $failure )
  14         device_with_error=${failure_split[0]}
  15         stripe_with_error=${failure_split[1]}
  16         repair_params="$stripe_with_error ${failure_split[2]} ${failure_split[3]}"
  17         start_of_errors_in_kib=$[data_offset_in_kib+chunksize_in_kib*stripe_with_error]
  18
  19         # make a raid5 from a file
  20         dd if=/dev/urandom of=/tmp/RandFile bs=1024 count=$array_data_size_in_kib
  21         mdadm -CR $md0 -l6 -n$number_of_disks -c $chunksize_in_kib $devs
  22         dd if=/tmp/RandFile of=$md0 bs=1024 count=$array_data_size_in_kib
  23         blockdev --flushbufs $md0; sync
  24
  25         check wait
  26         blockdev --flushbufs $devs; sync
  27         echo 3 > /proc/sys/vm/drop_caches
  28         cmp -s -n $array_data_size_in_b $md0 /tmp/RandFile || { echo sanity cmp failed ; exit 2; }
  29
  30         dd if=/dev/urandom of=$device_with_error bs=1024 count=$chunksize_in_kib seek=$start_of_errors_in_kib
  31         blockdev --flushbufs $device_with_error; sync
  32         echo 3 > /proc/sys/vm/drop_caches
  33
  34         $dir/raid6check $md0 0 0 2>&1 | grep -qs "Error" || { echo should detect errors; exit 2; }
  35
  36         $dir/raid6check $md0 repair $repair_params > /dev/null || { echo repair failed; exit 2; }
  37         blockdev --flushbufs $md0 $devs; sync
  38         echo 3 > /proc/sys/vm/drop_caches
  39
  40         $dir/raid6check $md0 0 0 2>&1 | grep -qs "Error" && { echo errors detected; exit 2; }
  41         cmp -s -n $array_data_size_in_b $md0 /tmp/RandFile || { echo cmp failed ; exit 2; }
  42
  43         mdadm -S $md0
  44         udevadm settle
  45         sync
  46         echo 3 > /proc/sys/vm/drop_caches
  47 done