[Bug 1371634] Re: block devices appear twice

[Jeff Lane]

Sorry for the vague comment earlier.  What I meant was that, from a
certification point of view, I can't certify a system that ships by
default with dual RAID cards in a multipath configuration when
Multipathing in Ubuntu doesn't work.  That leads to a scenario where,
out of the box on a fresh install you can destroy your own root
filesystem by formatting a drive that you don't realize is actually your
root fs...

In other words, it is very easy to destroy data accidentally if you're
unaware that sde and sda are the same physical device, as you would
reasonably expect those to be separate devices.

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https://bugs.launchpad.net/bugs/1371634

Title:
  block devices appear twice

Status in curtin package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Invalid
Status in multipath-tools package in Ubuntu:
  Confirmed

Bug description:
  $ sudo blkid 
  /dev/sr0: LABEL="Ubuntu-Server 14.04 LTS ppc64el" TYPE="iso9660" 
  /dev/sda2: UUID="795a6e14-ea4e-4718-9e98-c6df3696920c" TYPE="ext4" 
  /dev/sda3: UUID="0a91d81f-6a16-4b96-a92c-11ca8bdc4bf4" TYPE="swap" 
  /dev/sdb2: UUID="1d14c1f3-716f-4fb8-9070-d321b39ffcb3" TYPE="ext4" 
  /dev/sdb3: UUID="9c228177-d65c-4d19-a462-db1891e9781e" TYPE="swap" 
  /dev/sdg2: UUID="795a6e14-ea4e-4718-9e98-c6df3696920c" TYPE="ext4" 
  /dev/sdg3: UUID="0a91d81f-6a16-4b96-a92c-11ca8bdc4bf4" TYPE="swap" 
  /dev/sdh2: UUID="1d14c1f3-716f-4fb8-9070-d321b39ffcb3" TYPE="ext4" 
  /dev/sdh3: UUID="9c228177-d65c-4d19-a462-db1891e9781e" TYPE="swap" 

  I'm not sure what exactly those block devices are (as in if they're
  raided in hardware or they actually represent physical spinning
  disks).  But I do know that writing data to sda causes that data to be
  readable from sdg.

  The same is true:
   sda -> sdg
   sdb -> sdh

  That is what causes those UUIDs to be similar.  Everything is
  functional, you just have to know that if your root device is /dev/sdg
  that you should probably not write data to /dev/sda thinking you can
  use it as a disk.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic ppc64le
  AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access /dev/snd/: No such file or directory
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: ppc64el
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  CurrentDmesg: [   88.736220] init: plymouth-upstart-bridge main process ended, respawning
  Date: Fri Sep 19 14:31:20 2014
  HibernationDevice: RESUME=UUID=9c228177-d65c-4d19-a462-db1891e9781e
  Lsusb:
   Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: root=UUID=1d14c1f3-716f-4fb8-9070-d321b39ffcb3 ro console=hvc0 BOOTIF=01-6c-ae-8b-6a-a0-88 quiet
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.6
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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