[Bug 1766242] [NEW] Stopping RAID and then trying to reassemble Fails

[Vishwanath Ramalingam]

Public bug reported:

1. Open terminal and create RAID using mdadm.
For eg : mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/nvme0n1 /dev/nvme1n1
2. Stop RAID by using below command.
mdadm --manage --stop /dev/md0
3. Reassemble the RAID by using below command.
mdadm --examine --scan >> /etc/mdadm.conf 
mdadm --assemble --scan /dev/md0

Observation: 
RAID reassembling Fails by below error message. 
"/dev/md0 is not specified in config file."

Note:
RAID is created using nvme drive on Ubuntu 17.10

dmesglogs:
[  788.765804] md0: detected capacity change from 0 to 4450616344576
[  888.180976] EXT4-fs (md0): mounted filesystem with ordered data mode. Opts: (null)

[  939.509058] md0: detected capacity change from 4450616344576 to 0

[  939.509067] md: md0 stopped.

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

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https://bugs.launchpad.net/bugs/1766242

Title:
  Stopping RAID and then trying to reassemble Fails

Status in mdadm package in Ubuntu:
  New

Bug description:
  1. Open terminal and create RAID using mdadm.
  For eg : mdadm --create /dev/md0 --level=0 --raid-devices=2 /dev/nvme0n1 /dev/nvme1n1
  2. Stop RAID by using below command.
  mdadm --manage --stop /dev/md0
  3. Reassemble the RAID by using below command.
  mdadm --examine --scan >> /etc/mdadm.conf 
  mdadm --assemble --scan /dev/md0

  Observation: 
  RAID reassembling Fails by below error message. 
  "/dev/md0 is not specified in config file."

  Note:
  RAID is created using nvme drive on Ubuntu 17.10

  dmesglogs:
  [  788.765804] md0: detected capacity change from 0 to 4450616344576
  [  888.180976] EXT4-fs (md0): mounted filesystem with ordered data mode. Opts: (null)

  [  939.509058] md0: detected capacity change from 4450616344576 to 0

  [  939.509067] md: md0 stopped.

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