Hi
Here is the multipath-tools version

/ Name           Version        Description
+++-==============-==============-============================================
ii  multipath-tool 0.4.9-2ubuntu1 maintain multipath block device access

Vincent Chen
EMC2 | E-Lab Linux team

-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of Cruz Bishop
Sent: Thursday, April 26, 2012 5:01 AM
To: Chen, Vincent
Subject: [Bug 985741] Re: multipath can't show device on which is setup lvm

Hi, sorry it's taken so long for somebody to look at this bug.

Just out of interest, what version of multipath-tools are you using? I
saw somewhere that there was a change in configuration between 0.4.9 and
all earlier versions, but I'm not sure if that could do something like
this.

** Changed in: multipath-tools (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/985741

Title:
  multipath can't show device on which is setup lvm

Status in “multipath-tools” package in Ubuntu:
  Confirmed

Bug description:
  root@SGELLIN119:~# lsb_release -rd
  Description:    Ubuntu 11.10
  Release:        11.10

  affect package: multipath-tools, lvm2

  If  creating logical volume with Multipath on disk primary partition 1, multipath can’t find the 
  disks. Syslog show  such error when booting system

  kernel: [   27.604034] device-mapper: table: 252:5: multipath: error getting device
  kernel: [   27.604115] device-mapper: ioctl: error adding target to table

  
  I use fdisk to create two partitions on one physical lun.

  Mpath6:
  /dev/mapper/mpath6-part1
  /dev/mapper/mpath6-part2

  Mpath7:
  /dev/mapper/mpath7-part1
  /dev/mapper/mpath7-part2

  create a logical volume on  mpath6-part2, mpath7-part2
  Reboot  host, there is no exception and error logs. Multipath could
  Find all devices.

  root@SGELLIN119:~# multipath -ll | grep SYMM
  mpath9 (360000970000192602316533030453335) dm-10 EMC,SYMMETRIX
  mpath8 (360000970000192602316533030453334) dm-6 EMC,SYMMETRIX
  mpath7 (360000970000192602316533030453333) dm-7 EMC,SYMMETRIX
  mpath6 (360000970000192602316533030453332) dm-4 EMC,SYMMETRIX
  mpath5 (360000970000192602316533030453331) dm-3 EMC,SYMMETRIX

  
  root@SGELLIN119:~# lvs -v
      Finding all logical volumes
    LV      VG      #Seg Attr   LSize    Maj Min KMaj KMin Origin Snap%  Move Copy%  Log Convert LV UUID                       
    mlv     my_vg      1 -wi-a- 1020.00m  -1  -1 252  22                                         c3cECW-CJry-OdXI-O9bZ-lXq8-BUYq-obzcvB
    sym_lv2 sym_vg2    2 -wi-a-  200.00m  -1  -1 252  20                                         1t9SZa-QEEm-2u6p-lCqN-aqcd-xOpn-dC1YAu
    sym_lv3 sym_vg3    2 -wi-a-  200.00m  -1  -1 252  21                                         w4H00r-l71s-UURm-C32C-wDuS-fEF2-wlJFI0

  Then I use same way to create a lv on mpath6-part1 and mpath7-part1
  After rebooting host,  there are some error logs happen. 
  Multipath can’t find mpath6 and mapth7.  Of course the logical volums on
  Mpath6 and mpath7 were lost also.

  
  root@SGELLIN119:~# multipath -ll| grep SYMM
  mpath9 (360000970000192602316533030453335) dm-3 EMC,SYMMETRIX
  mpath8 (360000970000192602316533030453334) dm-2 EMC,SYMMETRIX
  mpath5 (360000970000192602316533030453331) dm-5 EMC,SYMMETRIX

  
  root@SGELLIN119:~# lvs -v
      Finding all logical volumes
    LV   VG    #Seg Attr   LSize    Maj Min KMaj KMin Origin Snap%  Move Copy%  Log Convert LV UUID                            
    mlv  my_vg    1 -wi-a- 1020.00m  -1  -1 252  1                                          c3cECW-CJry-OdXI-O9bZ-lXq8-BUYq-obzcvB

  
  the finding is that if creating lvm on disk primary partition 1.  Something were changed  and it lead multipath
  couldn’t find devices.

  root@SGELLIN119:~# udevadm info --query=all --name=/dev/mapper/mpath6
  P: /devices/virtual/block/dm-8
  N: dm-8
  L: -100
  S: mapper/mpath6
  S: disk/by-id/dm-name-mpath6
  S: disk/by-id/dm-uuid-mpath-360000970000192602316533030453332
  E: UDEV_LOG=3
  E: DEVPATH=/devices/virtual/block/dm-8
  E: MAJOR=252
  E: MINOR=8
  E: DEVNAME=/dev/dm-8
  E: DEVTYPE=disk
  E: SUBSYSTEM=block
  E: DM_NAME=mpath6
  E: DM_UUID=mpath-360000970000192602316533030453332
  E: DM_SUSPENDED=0
  E: DM_UDEV_RULES=1
  E: DEVLINKS=/dev/mapper/mpath6 /dev/disk/by-id/dm-name-mpath6 /dev/disk/by-id/dm-uuid-mpath-360000970000192602316533030453332

  Value "L" is negative compare to normal one

  Here is an temporary recovery way:
  4)	Service multipath-tools stop
  5)	Dmsetup remove_all
  6)	Service multipath-tools start
  However, the issue is consistent  after I reboot OS.

  If I remove lv  ( still have LVM package in OS) ,  multipath work
  well.

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