[Bug 1386637] Comment bridged from LTC Bugzilla

[bugproxy]

------- Comment From bjking1 at us.ibm.com 2015-04-13 19:07 EDT-------
This is working as designed. multipath-tools does what it is told to do via /etc/multipath.conf. You need to blacklist any devices you don't want multipath-tools to create multipath devices for.

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Title:
  multipath shows non-mpath disks as being multipath

Status in multipath-tools package in Ubuntu:
  New

Bug description:
  Problem Description
  ======================
  non-multpath disks are classified as multipath after the multipath-tools package is installed.

  ---uname output---
  Linux uu04g1 3.16.0-21-generic #28-Ubuntu SMP Mon Oct 6 15:57:32 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux
   
  Machine Type = Tuleta pKVM guest 
   
  Steps to Reproduce
  =========================
  1) Create a guest with an unused, non-mpath disk (not the install disk) (a qemu img file is fine).  
  2) apt-get install multipath-tools.  
  3) multipath -ll. 
  4)  Note that  your file backed disks are showing up as mpath disks.
   

  Userspace tool common name: multipath 
  The userspace tool has the following bit modes: 64 
   
  System Dump Info:
    The system is not configured to capture a system dump.

  Userspace rpm: multipath-tools 
  Userspace tool obtained from project website:  multipath-tools v0.4.9 (05/33, 2016) 
   

  == Comment: #1 - Edward R. Cheslek <echeslak at us.ibm.com> - ==
  root at uu04g1:~# multipath -ll
  0QEMU    QEMU HARDDISK   drive-scsi0-0-1-0 dm-0 QEMU,QEMU HARDDISK
  size=20G features='0' hwhandler='0' wp=rw
  `-+- policy='round-robin 0' prio=1 status=active
    `- 0:0:1:0 sdb 8:16 active ready running
  0QEMU    QEMU HARDDISK   drive-scsi0-0-2-0 dm-1 QEMU,QEMU HARDDISK
  size=20G features='0' hwhandler='0' wp=rw
  `-+- policy='round-robin 0' prio=1 status=active
    `- 0:0:2:0 sdc 8:32 active ready running
  root at uu04g1:~# lsblk
  NAME                                              MAJ:MIN RM  SIZE RO TYPE  MOUNTPOINT
  sda                                                 8:0    0   20G  0 disk
  ??sda1                                              8:1    0    7M  0 part
  ??sda2                                              8:2    0 19.1G  0 part  /
  ??sda3                                              8:3    0  896M  0 part  [SWAP]
  sdb                                                 8:16   0   20G  0 disk
  ??0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20drive-scsi0-0-1-0
                                                    252:0    0   20G  0 mpath
  sdc                                                 8:32   0   20G  0 disk
  ??0QEMU\x20\x20\x20\x20QEMU\x20HARDDISK\x20\x20\x20drive-scsi0-0-2-0
                                                    252:1    0   20G  0 mpath
  root at uu04g1:~#
  root at uu04g1:~# lsscsi
  [0:0:0:0]    disk    QEMU     QEMU HARDDISK    2.0.  /dev/sda
  [0:0:1:0]    disk    QEMU     QEMU HARDDISK    2.0.  /dev/sdb
  [0:0:2:0]    disk    QEMU     QEMU HARDDISK    2.0.  /dev/sdc

  == Comment: #2 - Edward R. Cheslek <echeslak at us.ibm.com> - 2014-10-08 22:27:09 ==
  This is the xml file of the affected guest.  Please note that all disks are file backed.

  root at uu04g1:~# multipath -l
  0QEMU    QEMU HARDDISK   drive-scsi0-0-1-0 dm-0 QEMU,QEMU HARDDISK
  size=20G features='0' hwhandler='0' wp=rw
  `-+- policy='round-robin 0' prio=-1 status=active
    `- 0:0:1:0 sdb 8:16 active undef running
  0QEMU    QEMU HARDDISK   drive-scsi0-0-2-0 dm-1 QEMU,QEMU HARDDISK
  size=20G features='0' hwhandler='0' wp=rw
  `-+- policy='round-robin 0' prio=-1 status=active
    `- 0:0:2:0 sdc 8:32 active undef running

  root at uu04g1:~# multipath -v2
  root at uu04g1:~#

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