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The md filter can operate in two native modes: - normal: reads only the start of each device - full: reads both the start and end of each device md 1.0 devices place the superblock at the end of the device, so components of this version will only be identified and excluded when lvm uses the full md filter. Previously, the full md filter was only used in commands that could write to the device. Now, the full md filter is also applied when there is an md 1.0 device present on the system. This means the 'pvs' command can avoid displaying md 1.0 components (at the cost of doubling the i/o to every device on the system.) (The md filter can operate in a third mode, using udev, but this is disabled by default because there have been problems with reliability of the info returned from udev.)
102 lines
2.4 KiB
Bash
102 lines
2.4 KiB
Bash
#!/usr/bin/env bash
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# Copyright (C) 2018 Red Hat, Inc. All rights reserved.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions
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# of the GNU General Public License v.2.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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# TODO: once code get fixed, add matching 'check' calls
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SKIP_WITH_LVMPOLLD=1
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. lib/inittest
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test -f /proc/mdstat && grep -q raid1 /proc/mdstat || \
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modprobe raid1 || skip
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aux lvmconf 'devices/md_component_detection = 1'
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aux extend_filter_LVMTEST "a|/dev/md|"
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aux prepare_devs 4
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pvcreate "$dev2"
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aux prepare_md_dev 0 64 2 "$dev1" "$dev2"
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# Incorrectly shows $dev2 as PV for 'raid0'
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pvs -vvvv
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vgcreate $SHARED $vg "$dev3" "$dev4"
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# create 2 disk MD raid1 array
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# by default using metadata format 1.0 with data at the end of device
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aux prepare_md_dev 1 64 2 "$dev1" "$dev2"
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mddev=$(< MD_DEV)
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pvdev=$(< MD_DEV_PV)
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sleep 3
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mdadm --stop "$mddev"
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# copy fake PV/VG header PV3 -> PV2 (which is however md raid1 leg)
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dd if="$dev3" of="$dev2" bs=64k count=1 conv=fdatasync
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# remove VG on PV3 & PV4
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vgremove -f $vg
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sleep 3
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aux udev_wait
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# too bad 'dd' wakes up md array reassembling
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should not mdadm --detail "$mddev"
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should not mdadm --stop "$mddev"
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sleep 3
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# print what blkid thinks about each PV
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for i in "$dev1" "$dev2" "$dev3" "$dev4"
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do
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blkid -c /dev/null -w /dev/null "$i" || echo "Unknown signature"
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done
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# expect open count for each PV to be 0
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dmsetup info -c
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pvs -vvvv "$dev2" "$dev3" || true
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# still expect open count for each PV to be 0
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dmsetup info -c
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pvs -vvvv "$dev3" "$dev2" || true
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# and again we expect open count for each PV to be 0
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dmsetup info -c
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dmsetup table
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# even after 3 second of possible hidden raid array assembling
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sleep 3
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dmsetup info -c
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# if for any reason array went up - stop it again
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if mdadm --detail "$mddev" ; then
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mdadm --stop "$mddev"
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aux udev_wait
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should not mdadm --detail "$mddev"
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fi
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# now reassemble array from PV1 & PV2
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mdadm --assemble --verbose "$mddev" "$dev1" "$dev2"
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aux udev_wait
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sleep 1
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# and let 'fake hdr' to be fixed from master/primary leg
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# (when mdadm supports repair)
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if mdadm --action=repair "$mddev" ; then
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sleep 1
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pvscan -vvvv
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# should be showing correctly PV3 & PV4
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pvs -vvvv "$dev3" "$dev4"
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fi
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