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Date: Mon, 7 Sep 2009 20:55:19 +0200
From: Bastian Blank <waldi@debian.org>
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Subject: [linux-lvm] Bug#545524: dmsetup - LVM layer devices must not be
	used for UUID device
Reply-To: Bastian Blank <waldi@debian.org>, 545524@bugs.debian.org,
	LVM general discussion and development <linux-lvm@redhat.com>
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Package: dmsetup
Version: 2:1.02.36-4
Severity: important

The device-mapper udev rules currently produces UUID and LABEL entries
for all devices, including the LVM specific -real device and snapshot
devices.

| # lvs            
|   LV         VG        Attr   LSize  Origin Snap%  Move Log Copy%  Convert
|   test       vg0_devel owi-a-  2,00G
|   test1      vg0_devel swi-a-  1,00G test     0,00
| # ls -al /dev/mapper/vg0_devel-test*
| brw------- 1 waldi disk 254, 4  6. Sep 00:10 /dev/mapper/vg0_devel-test
| brw-rw---- 1 root  disk 254, 5  7. Sep 20:33 /dev/mapper/vg0_devel-test1
| brw-rw---- 1 root  disk 254, 7  7. Sep 20:33 /dev/mapper/vg0_devel-test1-cow
| brw------- 1 waldi disk 254, 6  7. Sep 20:33 /dev/mapper/vg0_devel-test-real
| # cat /dev/.udev/db/\\x2fdevices\\x2fvirtual\\x2fblock\\x2fdm-4
| N:mapper/vg0_devel-test
| S:block/254:4
| S:dm-4
| S:disk/by-id/dm-name-vg0_devel-test
| S:disk/by-id/dm-uuid-LVM-gQW16K2IGtKODuJvxplrppedk57IHSrsg6ATwJYh28mwsb271Cwni4UV1IXnYzmC
| S:disk/by-uuid/0995ba56-731a-4e9a-a047-d12ae5117606
| S:vg0_devel/test
[...]
| # cat /dev/.udev/db/\\x2fdevices\\x2fvirtual\\x2fblock\\x2fdm-5
| N:mapper/vg0_devel-test1
| S:block/254:5
| S:dm-5
| S:disk/by-id/dm-name-vg0_devel-test1
| S:disk/by-id/dm-uuid-LVM-gQW16K2IGtKODuJvxplrppedk57IHSrsoCyDbIs9tJJWNCvrS9bp23pyyxYCxve4
| S:disk/by-uuid/0995ba56-731a-4e9a-a047-d12ae5117606
| S:vg0_devel/test1
[...]
| # cat /dev/.udev/db/\\x2fdevices\\x2fvirtual\\x2fblock\\x2fdm-6
| N:mapper/vg0_devel-test-real
| S:block/254:6
| S:dm-6
| S:disk/by-id/dm-name-vg0_devel-test-real
| S:disk/by-id/dm-uuid-LVM-gQW16K2IGtKODuJvxplrppedk57IHSrsg6ATwJYh28mwsb271Cwni4UV1IXnYzmC-real
| S:disk/by-uuid/0995ba56-731a-4e9a-a047-d12ae5117606
[...]
| # cat /dev/.udev/db/\\x2fdevices\\x2fvirtual\\x2fblock\\x2fdm-7
| N:mapper/vg0_devel-test1-cow
| S:block/254:7
| S:dm-7
| S:disk/by-id/dm-name-vg0_devel-test1-cow
| S:disk/by-id/dm-uuid-LVM-gQW16K2IGtKODuJvxplrppedk57IHSrsoCyDbIs9tJJWNCvrS9bp23pyyxYCxve4-cow
[...]

So the LVs test and test1, plus the base device test-real define the
same UUID name.

Bastian

-- 
Only a fool fights in a burning house.
		-- Kank the Klingon, "Day of the Dove", stardate unknown