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# check that kernel an restripe interpret all the different layouts
# the same
# This involves changing the layout to each different possibility
# while MDADM_GROW_VERIFY is set.
testK=$[64*3*6]
dd if=/dev/urandom of=/tmp/RandFile bs=1024 count=$testK
export MDADM_GROW_VERITY=1
dotest() {
sleep 0.5
check wait
testdev $md0 $1 $mdsize1 512 nd
blockdev --flushbufs $md0
cmp -s -n $[textK*1024] $md0 /tmp/RandFile || { echo cmp failed; exit 2; }
# write something new - shift chars 4 space
tr ' -~' '$-~ -#' < /tmp/RandFile > /tmp/RandFile2
mv /tmp/RandFile2 /tmp/RandFile
dd if=/tmp/RandFile of=$md0
}
checkgeo() {
# check the geometry of an array
# level raid_disks chunk_size layout
dev=$1
shift
sleep 0.5
check wait
for attr in level raid_disks chunk_size layout
do
if [ $# -gt 0 ] ; then
val=$1
shift
if [ " `cat /sys/block/$dev/md/$attr`" != " $val" ]
then echo "$attr doesn't match for $dev"
exit 1
fi
fi
done
}
bu=/tmp/md-test-backup
rm -f $bu
# first a degraded 5 device raid5
mdadm -CR $md0 -l5 -n5 $dev0 $dev1 missing $dev2 $dev3
dd if=/tmp/RandFile of=$md0
dotest 4
l5[0]=la
l5[1]=ra
l5[2]=ls
l5[3]=rs
l5[4]=parity-first
l5[5]=parity-last
for layout in 0 1 2 3 4 5 0
do
mdadm -G $md0 --layout=${l5[$layout]} --backup-file $bu
checkgeo md0 raid5 5 $[512*1024] $layout
dotest 4
done
mdadm -S $md0
# now a doubly degraded raid6
mdadm -CR $md0 -l6 -n5 $dev0 missing $dev2 missing $dev4
dd if=/tmp/RandFile of=$md0
dotest 3
l6[0]=la
l6[1]=ra
l6[2]=ls
l6[3]=rs
l6[4]=parity-first
l6[5]=parity-last
l6[8]=ddf-zero-restart
l6[9]=ddf-N-restart
l6[10]=ddf-N-continue
l6[16]=left-asymmetric-6
l6[17]=right-asymmetric-6
l6[18]=left-symmetric-6
l6[19]=right-symmetric-6
l6[20]=parity-first-6
for layout in 0 1 2 3 4 5 8 9 10 16 17 18 19 20 0
do
mdadm -G $md0 --layout=${l6[$layout]} --backup-file $bu
checkgeo md0 raid6 5 $[512*1024] $layout
dotest 3
done
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