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# check data integrity with raid5 write back cache
# create a 4kB random file and 4 files each with a 1kB chunk of the random file:
# randfile: ABCD randchunk[0-3]: A B C D
#
# then create another random 1kB chunk E, and a new random page with A, B, E, D:
# randchunk4: E newrandfile: ABED
create_random_data() {
dd if=/dev/urandom of=/tmp/randfile bs=4k count=1
for x in {0..3}
do
dd if=/tmp/randfile of=/tmp/randchunk$x bs=1k count=1 skip=$x count=1
done
dd if=/dev/urandom of=/tmp/randchunk4 bs=1k count=1
rm /tmp/newrandfile
for x in 0 1 4 3
do
cat /tmp/randchunk$x >> /tmp/newrandfile
done
}
# create array, $1 could be 5 for raid5 and 6 for raid6
create_array() {
if [ $1 -lt 5 -o $1 -gt 6 ]
then
echo wrong array type $1
exit 2
fi
mdadm -CR $md0 -c4 -l5 -n10 $dev0 $dev1 $dev2 $dev3 $dev4 $dev5 $dev6 $dev11 $dev8 $dev9 --write-journal $dev10
check wait
echo write-back > /sys/block/md0/md/journal_mode
}
restart_array_write_back() {
mdadm -S $md0
mdadm -A $md0 $dev0 $dev1 $dev2 $dev3 $dev4 $dev5 $dev6 $dev11 $dev8 $dev9 $dev10
echo write-back > /sys/block/md0/md/journal_mode
}
# compare the first page of md0 with file in $1
cmp_first_page() {
cmp -n 4096 $1 $md0 || { echo cmp failed ; exit 2 ; }
}
# write 3 pages after the first page of md0
write_three_pages() {
for x in {1..3}
do
dd if=/dev/urandom of=$md0 bs=4k count=1 seek=$x count=1
done
}
# run_test <array_type:5/6> <degraded_or_not:yes/no>
run_test() {
create_random_data
create_array $1
if [ $2 == yes ]
then
mdadm --fail $md0 $dev0
fi
dd if=/tmp/randfile of=$md0 bs=4k count=1
restart_array_write_back
cmp_first_page /tmp/randfile
restart_array_write_back
write_three_pages
cmp_first_page /tmp/randfile
dd if=/tmp/randchunk4 of=/dev/md0 bs=1k count=1 seek=2
restart_array_write_back
cmp_first_page /tmp/newrandfile
restart_array_write_back
write_three_pages
cmp_first_page /tmp/newrandfile
mdadm -S $md0
}
run_test 5 no
run_test 5 yes
run_test 6 no
run_test 6 yes
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