[Bug 1825075] [NEW] (bionic) boot with degraded RAID array for non-root device enters emergency mode

[Trent Lloyd]

Public bug reported:

When booting a Bionic system where an MDADM RAID device is degraded
(e.g. 1 of 2 disks appear) and that device is for a non-root filesystem
(e.g. /home) the boot enters emergency mode and the MD device stays
inactive.

This can be reproduced using the live server installation CD, 3 disks -
1 for /, and 2 for a software RAID which is then mounted to /home as
ext4.

After first boot, shutdown the system, remove one of the two RAID disks,
and boot the system.

** Affects: mdadm (Ubuntu)
     Importance: High
         Status: Confirmed

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https://bugs.launchpad.net/bugs/1825075

Title:
  (bionic) boot with degraded RAID array for non-root device enters
  emergency mode

Status in mdadm package in Ubuntu:
  Confirmed

Bug description:
  When booting a Bionic system where an MDADM RAID device is degraded
  (e.g. 1 of 2 disks appear) and that device is for a non-root
  filesystem (e.g. /home) the boot enters emergency mode and the MD
  device stays inactive.

  This can be reproduced using the live server installation CD, 3 disks
  - 1 for /, and 2 for a software RAID which is then mounted to /home as
  ext4.

  After first boot, shutdown the system, remove one of the two RAID
  disks, and boot the system.

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