dom0 ~ # cat /proc/partitions
major minor  #blocks  name

   8     0   20971520 sda
   8     1     977919 sda1
   8     2    3907584 sda2
   8     3    3907584 sda3
   8     4          1 sda4
   8     5    9766911 sda5
   8     6    2411519 sda6
   8    16   20971520 sdb
   8    17     977919 sdb1
   8    18    3907584 sdb2
   8    19    3907584 sdb3
   8    20          1 sdb4
   8    21    9766911 sdb5
   8    22    2411519 sdb6
 254     0   20971520 dm-0
 254     1     977919 dm-1
 254     2    3907584 dm-2
 254     3    3907584 dm-3
 254     4    9766911 dm-4
 254     5    2411519 dm-5
dom0 ~ # multipath -ll
system (3600a0b80001f3e190000552a4ab06e95)
[size=20 GB][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=1][enabled]
 \_ 0:0:1:0 sda 8:0   [active][ready]
\_ round-robin 0 [prio=6][active]
 \_ 1:0:1:0 sdb 8:16  [active][ready]
dom0 ~ # dmsetup ls --target multipath
system	(254, 0)
dom0 ~ # for i in /sys/block/* ; do udevadm info --query=all  --path=$i ; done ;
P: /block/dm-0
N: mapper/system
L: -100
S: block/254:0
S: dm-0
S: disk/by-id/dm-name-system
S: disk/by-id/dm-uuid-3600a0b80001f3e190000552a4ab06e95
E: UDEV_LOG=3
E: DEVPATH=/block/dm-0
E: DEVNAME=/dev/mapper/system
E: DEVTYPE=disk
E: DM_NAME=system
E: DM_MAJOR=254
E: DM_MINOR=0
E: DM_STATUS=ACTIVE
E: DM_READ_ONLY=0
E: DM_EXISTS=1
E: DM_SUSPENDED=Active
E: DM_TABLE_LIVE=1
E: DM_TABLE_INACTIVE=0
E: DM_OPEN=5
E: DM_SEGMENTS=1
E: DM_EVENTS=1
E: DM_UUID=3600a0b80001f3e190000552a4ab06e95
E: DM_TARGET_TYPES=multipath
E: DEVLINKS=/dev/block/254:0 /dev/dm-0 /dev/disk/by-id/dm-name-system /dev/disk/by-id/dm-uuid-3600a0b80001f3e190000552a4ab06e95

P: /block/dm-1
N: mapper/system1
L: -100
S: block/254:1
S: dm-1
S: disk/by-id/dm-name-system1
S: disk/by-uuid/6f61cb09-3bbd-49bc-a5d4-bff65c0618a3
E: UDEV_LOG=3
E: DEVPATH=/block/dm-1
E: DEVNAME=/dev/mapper/system1
E: DEVTYPE=disk
E: DM_NAME=system1
E: DM_MAJOR=254
E: DM_MINOR=1
E: DM_STATUS=ACTIVE
E: DM_READ_ONLY=0
E: DM_EXISTS=1
E: DM_SUSPENDED=Active
E: DM_TABLE_LIVE=1
E: DM_TABLE_INACTIVE=0
E: DM_OPEN=0
E: DM_SEGMENTS=1
E: DM_EVENTS=0
E: DM_TARGET_TYPES=linear
E: ID_FS_USAGE=filesystem
E: ID_FS_TYPE=ext2
E: ID_FS_VERSION=1.0
E: ID_FS_UUID=6f61cb09-3bbd-49bc-a5d4-bff65c0618a3
E: ID_FS_UUID_ENC=6f61cb09-3bbd-49bc-a5d4-bff65c0618a3
E: FSTAB_NAME=/dev/mapper/system1
E: FSTAB_DIR=/boot
E: FSTAB_TYPE=ext2
E: FSTAB_OPTS=noauto,noatime
E: FSTAB_FREQ=1
E: FSTAB_PASSNO=2
E: DEVLINKS=/dev/block/254:1 /dev/dm-1 /dev/disk/by-id/dm-name-system1 /dev/disk/by-uuid/6f61cb09-3bbd-49bc-a5d4-bff65c0618a3

P: /block/dm-2
N: mapper/system2
L: -100
S: block/254:2
S: dm-2
S: disk/by-id/dm-name-system2
S: disk/by-uuid/cb6ab4d1-bb29-4022-8bef-6648d0301a7a
E: UDEV_LOG=3
E: DEVPATH=/block/dm-2
E: DEVNAME=/dev/mapper/system2
E: DEVTYPE=disk
E: DM_NAME=system2
E: DM_MAJOR=254
E: DM_MINOR=2
E: DM_STATUS=ACTIVE
E: DM_READ_ONLY=0
E: DM_EXISTS=1
E: DM_SUSPENDED=Active
E: DM_TABLE_LIVE=1
E: DM_TABLE_INACTIVE=0
E: DM_OPEN=0
E: DM_SEGMENTS=1
E: DM_EVENTS=0
E: DM_TARGET_TYPES=linear
E: ID_FS_USAGE=other
E: ID_FS_TYPE=swap
E: ID_FS_VERSION=2
E: ID_FS_UUID=cb6ab4d1-bb29-4022-8bef-6648d0301a7a
E: ID_FS_UUID_ENC=cb6ab4d1-bb29-4022-8bef-6648d0301a7a
E: FSTAB_NAME=/dev/mapper/system2
E: FSTAB_DIR=none
E: FSTAB_TYPE=swap
E: FSTAB_OPTS=sw
E: FSTAB_FREQ=0
E: FSTAB_PASSNO=0
E: DEVLINKS=/dev/block/254:2 /dev/dm-2 /dev/disk/by-id/dm-name-system2 /dev/disk/by-uuid/cb6ab4d1-bb29-4022-8bef-6648d0301a7a

P: /block/dm-3
N: mapper/system3
L: -100
S: root
S: block/254:3
S: dm-3
S: disk/by-id/dm-name-system3
S: disk/by-uuid/6c5c7215-c743-460a-b39b-d3c0d15370bc
E: UDEV_LOG=3
E: DEVPATH=/block/dm-3
E: DEVNAME=/dev/mapper/system3
E: DEVTYPE=disk
E: DM_NAME=system3
E: DM_MAJOR=254
E: DM_MINOR=3
E: DM_STATUS=ACTIVE
E: DM_READ_ONLY=0
E: DM_EXISTS=1
E: DM_SUSPENDED=Active
E: DM_TABLE_LIVE=1
E: DM_TABLE_INACTIVE=0
E: DM_OPEN=1
E: DM_SEGMENTS=1
E: DM_EVENTS=0
E: DM_TARGET_TYPES=linear
E: ID_FS_USAGE=filesystem
E: ID_FS_TYPE=ext3
E: ID_FS_VERSION=1.0
E: ID_FS_UUID=6c5c7215-c743-460a-b39b-d3c0d15370bc
E: ID_FS_UUID_ENC=6c5c7215-c743-460a-b39b-d3c0d15370bc
E: DEVLINKS=/dev/root /dev/block/254:3 /dev/dm-3 /dev/disk/by-id/dm-name-system3 /dev/disk/by-uuid/6c5c7215-c743-460a-b39b-d3c0d15370bc

P: /block/dm-4
E: UDEV_LOG=3
E: DEVPATH=/block/dm-4

P: /block/dm-5
E: UDEV_LOG=3
E: DEVPATH=/block/dm-5

P: /block/loop0
N: loop0
S: loop/0
S: block/7:0
E: UDEV_LOG=3
E: DEVPATH=/block/loop0
E: DEVNAME=/dev/loop0
E: DEVTYPE=disk
E: DEVLINKS=/dev/loop/0 /dev/block/7:0

P: /block/loop1
N: loop1
S: loop/1
S: block/7:1
E: UDEV_LOG=3
E: DEVPATH=/block/loop1
E: DEVNAME=/dev/loop1
E: DEVTYPE=disk
E: DEVLINKS=/dev/loop/1 /dev/block/7:1

P: /block/loop2
N: loop2
S: loop/2
S: block/7:2
E: UDEV_LOG=3
E: DEVPATH=/block/loop2
E: DEVNAME=/dev/loop2
E: DEVTYPE=disk
E: DEVLINKS=/dev/loop/2 /dev/block/7:2

P: /block/loop3
N: loop3
S: loop/3
S: block/7:3
E: UDEV_LOG=3
E: DEVPATH=/block/loop3
E: DEVNAME=/dev/loop3
E: DEVTYPE=disk
E: DEVLINKS=/dev/loop/3 /dev/block/7:3

P: /block/loop4
N: loop4
S: loop/4
S: block/7:4
E: UDEV_LOG=3
E: DEVPATH=/block/loop4
E: DEVNAME=/dev/loop4
E: DEVTYPE=disk
E: DEVLINKS=/dev/loop/4 /dev/block/7:4

P: /block/loop5
N: loop5
S: loop/5
S: block/7:5
E: UDEV_LOG=3
E: DEVPATH=/block/loop5
E: DEVNAME=/dev/loop5
E: DEVTYPE=disk
E: DEVLINKS=/dev/loop/5 /dev/block/7:5

P: /block/loop6
N: loop6
S: loop/6
S: block/7:6
E: UDEV_LOG=3
E: DEVPATH=/block/loop6
E: DEVNAME=/dev/loop6
E: DEVTYPE=disk
E: DEVLINKS=/dev/loop/6 /dev/block/7:6

P: /block/loop7
N: loop7
S: loop/7
S: block/7:7
E: UDEV_LOG=3
E: DEVPATH=/block/loop7
E: DEVNAME=/dev/loop7
E: DEVTYPE=disk
E: DEVLINKS=/dev/loop/7 /dev/block/7:7

P: /block/nbd0
N: nbd0
S: block/43:0
E: UDEV_LOG=3
E: DEVPATH=/block/nbd0
E: DEVNAME=/dev/nbd0
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:0

P: /block/nbd1
N: nbd1
S: block/43:1
E: UDEV_LOG=3
E: DEVPATH=/block/nbd1
E: DEVNAME=/dev/nbd1
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:1

P: /block/nbd10
N: nbd10
S: block/43:10
E: UDEV_LOG=3
E: DEVPATH=/block/nbd10
E: DEVNAME=/dev/nbd10
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:10

P: /block/nbd11
N: nbd11
S: block/43:11
E: UDEV_LOG=3
E: DEVPATH=/block/nbd11
E: DEVNAME=/dev/nbd11
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:11

P: /block/nbd12
N: nbd12
S: block/43:12
E: UDEV_LOG=3
E: DEVPATH=/block/nbd12
E: DEVNAME=/dev/nbd12
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:12

P: /block/nbd13
N: nbd13
S: block/43:13
E: UDEV_LOG=3
E: DEVPATH=/block/nbd13
E: DEVNAME=/dev/nbd13
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:13

P: /block/nbd14
N: nbd14
S: block/43:14
E: UDEV_LOG=3
E: DEVPATH=/block/nbd14
E: DEVNAME=/dev/nbd14
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:14

P: /block/nbd15
N: nbd15
S: block/43:15
E: UDEV_LOG=3
E: DEVPATH=/block/nbd15
E: DEVNAME=/dev/nbd15
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:15

P: /block/nbd2
N: nbd2
S: block/43:2
E: UDEV_LOG=3
E: DEVPATH=/block/nbd2
E: DEVNAME=/dev/nbd2
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:2

P: /block/nbd3
N: nbd3
S: block/43:3
E: UDEV_LOG=3
E: DEVPATH=/block/nbd3
E: DEVNAME=/dev/nbd3
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:3

P: /block/nbd4
N: nbd4
S: block/43:4
E: UDEV_LOG=3
E: DEVPATH=/block/nbd4
E: DEVNAME=/dev/nbd4
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:4

P: /block/nbd5
N: nbd5
S: block/43:5
E: UDEV_LOG=3
E: DEVPATH=/block/nbd5
E: DEVNAME=/dev/nbd5
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:5

P: /block/nbd6
N: nbd6
S: block/43:6
E: UDEV_LOG=3
E: DEVPATH=/block/nbd6
E: DEVNAME=/dev/nbd6
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:6

P: /block/nbd7
N: nbd7
S: block/43:7
E: UDEV_LOG=3
E: DEVPATH=/block/nbd7
E: DEVNAME=/dev/nbd7
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:7

P: /block/nbd8
N: nbd8
S: block/43:8
E: UDEV_LOG=3
E: DEVPATH=/block/nbd8
E: DEVNAME=/dev/nbd8
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:8

P: /block/nbd9
N: nbd9
S: block/43:9
E: UDEV_LOG=3
E: DEVPATH=/block/nbd9
E: DEVNAME=/dev/nbd9
E: DEVTYPE=disk
E: DEVLINKS=/dev/block/43:9

P: /block/ram0
N: ram0
S: rd/0
S: block/1:0
E: UDEV_LOG=3
E: DEVPATH=/block/ram0
E: DEVNAME=/dev/ram0
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/0 /dev/block/1:0

P: /block/ram1
N: ram1
S: rd/1
S: block/1:1
E: UDEV_LOG=3
E: DEVPATH=/block/ram1
E: DEVNAME=/dev/ram1
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/1 /dev/block/1:1

P: /block/ram10
N: ram10
S: rd/10
S: block/1:10
E: UDEV_LOG=3
E: DEVPATH=/block/ram10
E: DEVNAME=/dev/ram10
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/10 /dev/block/1:10

P: /block/ram11
N: ram11
S: rd/11
S: block/1:11
E: UDEV_LOG=3
E: DEVPATH=/block/ram11
E: DEVNAME=/dev/ram11
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/11 /dev/block/1:11

P: /block/ram12
N: ram12
S: rd/12
S: block/1:12
E: UDEV_LOG=3
E: DEVPATH=/block/ram12
E: DEVNAME=/dev/ram12
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/12 /dev/block/1:12

P: /block/ram13
N: ram13
S: rd/13
S: block/1:13
E: UDEV_LOG=3
E: DEVPATH=/block/ram13
E: DEVNAME=/dev/ram13
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/13 /dev/block/1:13

P: /block/ram14
N: ram14
S: rd/14
S: block/1:14
E: UDEV_LOG=3
E: DEVPATH=/block/ram14
E: DEVNAME=/dev/ram14
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/14 /dev/block/1:14

P: /block/ram15
N: ram15
S: rd/15
S: block/1:15
E: UDEV_LOG=3
E: DEVPATH=/block/ram15
E: DEVNAME=/dev/ram15
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/15 /dev/block/1:15

P: /block/ram2
N: ram2
S: rd/2
S: block/1:2
E: UDEV_LOG=3
E: DEVPATH=/block/ram2
E: DEVNAME=/dev/ram2
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/2 /dev/block/1:2

P: /block/ram3
N: ram3
S: rd/3
S: block/1:3
E: UDEV_LOG=3
E: DEVPATH=/block/ram3
E: DEVNAME=/dev/ram3
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/3 /dev/block/1:3

P: /block/ram4
N: ram4
S: rd/4
S: block/1:4
E: UDEV_LOG=3
E: DEVPATH=/block/ram4
E: DEVNAME=/dev/ram4
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/4 /dev/block/1:4

P: /block/ram5
N: ram5
S: rd/5
S: block/1:5
E: UDEV_LOG=3
E: DEVPATH=/block/ram5
E: DEVNAME=/dev/ram5
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/5 /dev/block/1:5

P: /block/ram6
N: ram6
S: rd/6
S: block/1:6
E: UDEV_LOG=3
E: DEVPATH=/block/ram6
E: DEVNAME=/dev/ram6
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/6 /dev/block/1:6

P: /block/ram7
N: ram7
S: rd/7
S: block/1:7
E: UDEV_LOG=3
E: DEVPATH=/block/ram7
E: DEVNAME=/dev/ram7
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/7 /dev/block/1:7

P: /block/ram8
N: ram8
S: rd/8
S: block/1:8
E: UDEV_LOG=3
E: DEVPATH=/block/ram8
E: DEVNAME=/dev/ram8
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/8 /dev/block/1:8

P: /block/ram9
N: ram9
S: rd/9
S: block/1:9
E: UDEV_LOG=3
E: DEVPATH=/block/ram9
E: DEVNAME=/dev/ram9
E: DEVTYPE=disk
E: DEVLINKS=/dev/rd/9 /dev/block/1:9

P: /block/sda
N: sda
S: block/8:0
S: disk/by-id/scsi-3600a0b80001f3e190000552a4ab06e95
E: UDEV_LOG=3
E: DEVPATH=/block/sda
E: DEVNAME=/dev/sda
E: DEVTYPE=disk
E: ID_VENDOR=IBM
E: ID_VENDOR_ENC=IBM\x20\x20\x20\x20\x20
E: ID_MODEL=1722-600
E: ID_MODEL_ENC=1722-600\x20\x20\x20\x20\x20\x20\x20\x20
E: ID_REVISION=0914
E: ID_TYPE=disk
E: ID_SERIAL=3600a0b80001f3e190000552a4ab06e95
E: ID_SERIAL_SHORT=600a0b80001f3e190000552a4ab06e95
E: ID_BUS=scsi
E: DEVLINKS=/dev/block/8:0 /dev/disk/by-id/scsi-3600a0b80001f3e190000552a4ab06e95

P: /block/sdb
N: sdb
S: block/8:16
S: disk/by-id/scsi-3600a0b80001f3e190000552a4ab06e95
E: UDEV_LOG=3
E: DEVPATH=/block/sdb
E: DEVNAME=/dev/sdb
E: DEVTYPE=disk
E: ID_VENDOR=IBM
E: ID_VENDOR_ENC=IBM\x20\x20\x20\x20\x20
E: ID_MODEL=1722-600
E: ID_MODEL_ENC=1722-600\x20\x20\x20\x20\x20\x20\x20\x20
E: ID_REVISION=0914
E: ID_TYPE=disk
E: ID_SERIAL=3600a0b80001f3e190000552a4ab06e95
E: ID_SERIAL_SHORT=600a0b80001f3e190000552a4ab06e95
E: ID_BUS=scsi
E: DEVLINKS=/dev/block/8:16 /dev/disk/by-id/scsi-3600a0b80001f3e190000552a4ab06e95

dom0 ~ # for i in /dev/sd? ; do parted $i print ; done ;
Model: IBM 1722-600 (scsi)
Disk /dev/sda: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system  Flags
 1      512B    1001MB  1001MB  primary   ext2              
 2      1001MB  5003MB  4001MB  primary   linux-swap        
 3      5003MB  9004MB  4001MB  primary   ext3              
 4      9004MB  21.5GB  12.5GB  extended                    
 5      9004MB  19.0GB  10.0GB  logical   ext3              
 6      19.0GB  21.5GB  2469MB  logical   ext3              

Model: IBM 1722-600 (scsi)
Disk /dev/sdb: 21.5GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End     Size    Type      File system  Flags
 1      512B    1001MB  1001MB  primary   ext2              
 2      1001MB  5003MB  4001MB  primary   linux-swap        
 3      5003MB  9004MB  4001MB  primary   ext3              
 4      9004MB  21.5GB  12.5GB  extended                    
 5      9004MB  19.0GB  10.0GB  logical   ext3              
 6      19.0GB  21.5GB  2469MB  logical   ext3