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number_of_disks=4
chunksize_in_kib=512
chunksize_in_b=$[chunksize_in_kib*1024]
array_data_size_in_kib=$[chunksize_in_kib*(number_of_disks-2)*number_of_disks]
array_data_size_in_b=$[array_data_size_in_kib*1024]
devs="$dev1 $dev2 $dev3 $dev4"
# default 2048 sectors
data_offset_in_kib=$[2048/2]
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" "$dev4 3 3 2" \
"$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
failure_split=( $failure )
device_with_error=${failure_split[0]}
stripe_with_error=${failure_split[1]}
repair_params="$stripe_with_error ${failure_split[2]} ${failure_split[3]}"
start_of_errors_in_kib=$[data_offset_in_kib+chunksize_in_kib*stripe_with_error]
# make a raid5 from a file
dd if=/dev/urandom of=/tmp/RandFile bs=1024 count=$array_data_size_in_kib
mdadm -CR $md0 -l6 -n$number_of_disks -c $chunksize_in_kib $devs
dd if=/tmp/RandFile of=$md0 bs=1024 count=$array_data_size_in_kib
blockdev --flushbufs $md0; sync
check wait
blockdev --flushbufs $devs; sync
echo 3 > /proc/sys/vm/drop_caches
cmp -s -n $array_data_size_in_b $md0 /tmp/RandFile || { echo sanity cmp failed ; exit 2; }
dd if=/dev/urandom of=$device_with_error bs=1024 count=$chunksize_in_kib seek=$start_of_errors_in_kib
blockdev --flushbufs $device_with_error; sync
echo 3 > /proc/sys/vm/drop_caches
$dir/raid6check $md0 0 0 2>&1 | grep -qs "Error" || { echo should detect errors; exit 2; }
$dir/raid6check $md0 repair $repair_params > /dev/null || { echo repair failed; exit 2; }
blockdev --flushbufs $md0 $devs; sync
echo 3 > /proc/sys/vm/drop_caches
$dir/raid6check $md0 0 0 2>&1 | grep -qs "Error" && { echo errors detected; exit 2; }
cmp -s -n $array_data_size_in_b $md0 /tmp/RandFile || { echo cmp failed ; exit 2; }
mdadm -S $md0
udevadm settle
sync
echo 3 > /proc/sys/vm/drop_caches
done
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