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