tests/19raid6auto-repair

   1 number_of_disks=5
   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=$[array_data_size_in_kib*1024]
   6 devs="$dev0 $dev1 $dev2 $dev3 $dev4"
   7
   8 # default 32 sectors
   9 data_offset_in_kib=$[32/2]
  10
  11 # make a raid5 from a file
  12 dd if=/dev/urandom of=/tmp/RandFile bs=1024 count=$array_data_size_in_kib
  13 mdadm -CR $md0 -l6 -n$number_of_disks -c $chunksize_in_kib $devs
  14 dd if=/tmp/RandFile of=$md0 bs=1024 count=$array_data_size_in_kib
  15 blockdev --flushbufs $md0; sync
  16 check wait
  17 blockdev --flushbufs $devs; sync
  18 echo 3 > /proc/sys/vm/drop_caches
  19 cmp -s -n $array_data_size_in_b $md0 /tmp/RandFile || { echo sanity cmp failed ; exit 2; }
  20
  21 # wipe out 5 chunks on each device
  22 dd if=/dev/urandom of=$dev0 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*0]
  23 dd if=/dev/urandom of=$dev1 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*5]
  24 dd if=/dev/urandom of=$dev2 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*10]
  25 dd if=/dev/urandom of=$dev3 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*15]
  26 dd if=/dev/urandom of=$dev4 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*20]
  27
  28 blockdev --flushbufs $devs; sync
  29 echo 3 > /proc/sys/vm/drop_caches
  30
  31 $dir/raid6check $md0 0 0 2>&1 | grep -qs "Error" || { echo should detect errors; exit 2; }
  32
  33 $dir/raid6check $md0 0 0 autorepair > /dev/null || { echo repair failed; exit 2; }
  34 blockdev --flushbufs $md0 $devs; sync
  35 echo 3 > /proc/sys/vm/drop_caches
  36
  37 $dir/raid6check $md0 0 0 2>&1 | grep -qs "Error" && { echo errors detected; exit 2; }
  38 cmp -s -n $array_data_size_in_b $md0 /tmp/RandFile || { echo cmp failed ; exit 2; }
  39
  40 mdadm -S $md0
  41 udevadm settle
  42 blockdev --flushbufs $md0 $devs; sync
  43 echo 3 > /proc/sys/vm/drop_caches