Public bug reported:

I am using AWS c3.xlarge instance with 2xSSD (2x40GB) and system is
detecting/using only one of them:

root@localhost:~# cat /proc/partitions
major minor  #blocks  name

   1        0      65536 ram0
...
   1       15      65536 ram15
 202        1    8388608 xvda1 <====== ESB
 202       16   41934848 xvdb  <====== One of two SSD.

Same command with different output on Ubuntu 14.04 LTS

ubuntu@localhost:~$ cat /proc/partitions
major minor  #blocks  name

 202        0    8388608 xvda
 202        1    8377897 xvda1 <==== ESB
 202       16   41934848 xvdb  <==== first SSD
 202       32   41934848 xvdc  <==== second SSD
 252        0   78643200 dm-0

One SSD is missing.

Kernel version: Ubuntu 4.4.0-28.47-generic 4.4.13
Ubuntu version: Description:    Ubuntu 16.04.1 LTS, Release:    16.04

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1611958

Title:
  AWS Ubuntu 16.04 LTS doesn't detect 2xSSD on c3.xlarge

Status in linux package in Ubuntu:
  New

Bug description:
  I am using AWS c3.xlarge instance with 2xSSD (2x40GB) and system is
  detecting/using only one of them:

  root@localhost:~# cat /proc/partitions
  major minor  #blocks  name

     1        0      65536 ram0
  ...
     1       15      65536 ram15
   202        1    8388608 xvda1 <====== ESB
   202       16   41934848 xvdb  <====== One of two SSD.

  Same command with different output on Ubuntu 14.04 LTS

  ubuntu@localhost:~$ cat /proc/partitions
  major minor  #blocks  name

   202        0    8388608 xvda
   202        1    8377897 xvda1 <==== ESB
   202       16   41934848 xvdb  <==== first SSD
   202       32   41934848 xvdc  <==== second SSD
   252        0   78643200 dm-0

  One SSD is missing.

  Kernel version: Ubuntu 4.4.0-28.47-generic 4.4.13
  Ubuntu version: Description:  Ubuntu 16.04.1 LTS, Release:    16.04

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