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lvm2/test/t-pvcreate-operation-md.sh
Mike Snitzer 9c179ef418 Verify that pvcreate --dataalignment really does override the topology
detected alignment.

NOTE: lvm2 doesn't detect MD 1.2 metadata (now the default on RHEL6) so
for now I'm forcing 1.0 metadata.  This was needed to be able to reuse
the existing loop devices but recreate the md device with different
raid0 striping.
2010-08-21 15:43:45 +00:00

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# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# skip this test if mdadm or sfdisk (or others) aren't available
which mdadm || exit 200
which sfdisk || exit 200
which perl || exit 200
which awk || exit 200
which cut || exit 200
test -f /proc/mdstat && grep -q raid0 /proc/mdstat || \
modprobe raid0 || exit 200
. ./test-utils.sh
prepare_lvmconf '[ "a|/dev/md.*|", "a/dev\/mapper\/.*$/", "r/.*/" ]'
aux prepare_devs 2
# Have MD use a non-standard name to avoid colliding with an existing MD device
# - mdadm >= 3.0 requires that non-standard device names be in /dev/md/
# - newer mdadm _completely_ defers to udev to create the associated device node
mdadm_maj=$(mdadm --version 2>&1 | perl -pi -e 's|.* v(\d+).*|\1|')
[ $mdadm_maj -ge 3 ] && \
mddev=/dev/md/md_lvm_test0 || \
mddev=/dev/md_lvm_test0
cleanup_md() {
# sleeps offer hack to defeat: 'md: md127 still in use'
# see: https://bugzilla.redhat.com/show_bug.cgi?id=509908#c25
sleep 2
mdadm --stop $mddev || true
if [ -b "$mddev" ]; then
# mdadm doesn't always cleanup the device node
sleep 2
rm -f $mddev
fi
}
cleanup_md_and_teardown() {
cleanup_md
teardown
}
# create 2 disk MD raid0 array (stripe_width=128K)
test -b "$mddev" && exit 200
mdadm --create --metadata=1.0 $mddev --auto=md --level 0 --raid-devices=2 --chunk 64 $dev1 $dev2
trap 'aux cleanup_md_and_teardown' EXIT # cleanup this MD device at the end of the test
test -b "$mddev" || exit 200
# Test alignment of PV on MD without any MD-aware or topology-aware detection
# - should treat $mddev just like any other block device
pv_align="1.00m"
pvcreate --metadatasize 128k \
--config 'devices {md_chunk_alignment=0 data_alignment_detection=0 data_alignment_offset_detection=0}' \
$mddev
check_pv_field_ $mddev pe_start $pv_align
# Test md_chunk_alignment independent of topology-aware detection
pv_align="1.00m"
pvcreate --metadatasize 128k \
--config 'devices {data_alignment_detection=0 data_alignment_offset_detection=0}' \
$mddev
check_pv_field_ $mddev pe_start $pv_align
# Get linux minor version
linux_minor=$(echo `uname -r` | cut -d'.' -f3 | cut -d'-' -f1)
# Test newer topology-aware alignment detection
# - first added to 2.6.31 but not "reliable" until 2.6.33
if [ $linux_minor -ge 33 ]; then
pv_align="1.00m"
# optimal_io_size=131072, minimum_io_size=65536
pvcreate --metadatasize 128k \
--config 'devices { md_chunk_alignment=0 }' $mddev
check_pv_field_ $mddev pe_start $pv_align
fi
# partition MD array directly, depends on blkext in Linux >= 2.6.28
if [ $linux_minor -ge 28 ]; then
# create one partition
sfdisk $mddev <<EOF
,,83
EOF
# make sure partition on MD is _not_ removed
# - tests partition -> parent lookup via sysfs paths
not pvcreate --metadatasize 128k $mddev
# verify alignment_offset is accounted for in pe_start
# - topology infrastructure is available in Linux >= 2.6.31
# - also tests partition -> parent lookup via sysfs paths
# Oh joy: need to lookup /sys/block/md127 rather than /sys/block/md_lvm_test0
mddev_maj_min=$(ls -lL $mddev | awk '{ print $5 $6 }' | perl -pi -e 's|,|:|')
mddev_p_sysfs_name=$(echo /sys/dev/block/${mddev_maj_min}/*p1)
base_mddev_p=`basename $mddev_p_sysfs_name`
mddev_p=/dev/${base_mddev_p}
# Checking for 'alignment_offset' in sysfs implies Linux >= 2.6.31
# but reliable alignment_offset support requires kernel.org Linux >= 2.6.33
sysfs_alignment_offset=/sys/dev/block/${mddev_maj_min}/${base_mddev_p}/alignment_offset
[ -f $sysfs_alignment_offset -a $linux_minor -ge 33 ] && \
alignment_offset=`cat $sysfs_alignment_offset` || \
alignment_offset=0
if [ $alignment_offset -gt 0 ]; then
# default alignment is 1M, add alignment_offset
pv_align=$((1048576+$alignment_offset))B
pvcreate --metadatasize 128k $mddev_p
check_pv_field_ $mddev_p pe_start $pv_align "--units b"
pvremove $mddev_p
fi
fi
# Test newer topology-aware alignment detection w/ --dataalignment override
if [ $linux_minor -ge 33 ]; then
cleanup_md
pvcreate -f $dev1
pvcreate -f $dev2
# create 2 disk MD raid0 array (stripe_width=2M)
test -b "$mddev" && exit 200
mdadm --create --metadata=1.0 $mddev --auto=md --level 0 --raid-devices=2 --chunk 1024 $dev1 $dev2
test -b "$mddev" || exit 200
# optimal_io_size=2097152, minimum_io_size=1048576
pv_align="2.00m"
pvcreate --metadatasize 128k \
--config 'devices { md_chunk_alignment=0 }' $mddev
check_pv_field_ $mddev pe_start $pv_align
# now verify pe_start alignment override using --dataalignment
pv_align="192.00k"
pvcreate --dataalignment 64k --metadatasize 128k \
--config 'devices { md_chunk_alignment=0 }' $mddev
check_pv_field_ $mddev pe_start $pv_align
fi