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number_of_disks=5
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=$[array_data_size_in_kib*1024]
devs="$dev0 $dev1 $dev2 $dev3 $dev4"
# default 2048 sectors
data_offset_in_kib=$[2048/2]
# 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 $md0 /tmp/RandFile || { echo sanity cmp failed ; exit 2; }
# wipe out 5 chunks on each device
dd if=/dev/urandom of=$dev0 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*0]
dd if=/dev/urandom of=$dev1 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*5]
dd if=/dev/urandom of=$dev2 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*10]
dd if=/dev/urandom of=$dev3 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*15]
dd if=/dev/urandom of=$dev4 bs=1024 count=$[5*chunksize_in_kib] seek=$[data_offset_in_kib+chunksize_in_kib*20]
blockdev --flushbufs $devs; 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 0 0 autorepair > /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
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