This test cases checks data integrity of raid5 write back cache under various scenarios: degraded mode, non-overwrite, raid-5/6. Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
88 lines
2.1 KiB
Plaintext
88 lines
2.1 KiB
Plaintext
# 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
|