[Bug 1030040] Re: multipath-tools create duplicate device

[vincent]

Hi,
I can't reproduce this issue now. It only happen once.  As my first description,  i use "multipath -f " to remove the duplicate device. then everything is ok.

Here is the log,configuratin file as requested. Due to no duplicated
devices are  produced, maybe these log can't help debuging.

** Attachment added: "multipath-no_demo"
   https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1030040/+attachment/3241574/+files/multipath_nodemo_2012-07-29165001.tar

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https://bugs.launchpad.net/bugs/1030040

Title:
  multipath-tools create duplicate device

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

Bug description:
  I am testing Ubuntu12.04LTS and find  multipath-tools could create
  duplicate device on same device.

  root at Linux51:~# lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 12.04 LTS
  Release:        12.04
  Codename:       precise

  
  root at Linux51:~# apt-cache policy multipath-tools
  multipath-tools:
    Installed: 0.4.9-3ubuntu5
    Candidate: 0.4.9-3ubuntu5
    Version table:
   *** 0.4.9-3ubuntu5 0


  root at Linux51:~# multipath -ll mpath35
  mpath35 (3600601601c102900cce9d9e2ae3fe011) dm-19 DGC,VRAID
  size=12G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
  |-+- policy='round-robin 0' prio=1 status=active
  | |- 5:0:3:10 sdau 66:224 active ready running
  | `- 6:0:3:10 sddg 70:224 active ready running
  `-+- policy='round-robin 0' prio=0 status=enabled
    |- 5:0:2:10 sdr  65:16  active ready running
    `- 6:0:2:10 sdcd 69:16  active ready running
  root at Linux51:~# multipath -ll mpath36
  mpath36 (3600601601c102900d4e9d9e2ae3fe011) dm-20 DGC,VRAID
  size=12G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
  |-+- policy='round-robin 0' prio=1 status=active
  | |- 5:0:3:10 sdau 66:224 active ready running
  | `- 6:0:3:10 sddg 70:224 active ready running
  `-+- policy='round-robin 0' prio=0 status=enabled
    |- 5:0:2:10 sdr  65:16  active ready running
    `- 6:0:2:10 sdcd 69:16  active ready running

  after useing multipath -f 3600601601c102900cce9d9e2ae3fe011,  the
  mpath35 disapper, even reboot host

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