[Bug 1469269] [NEW] Degraded software RAID boot problems

[Gareth]

Public bug reported:

Please ignore bug report #1466803 as it is inaccurate - this replaces
it.

The Setup:
VirtualBox 2 x 8GB disks
Software RAID 1 or 10:
md0 = 1GB /boot bootable
md1 = 7GB LVM (1GB swap, 6GB root) - encrypted for (1) below so the initial setup looks like...

for test 1:  Software RAID > encrypted volume > LVM
for test 2:  Software RAID > LVM

The issues (tested on VirtualBox with and on 14.04.2):

1. Boot of encrypted LVM RAID system hangs when disk is removed.  
Last boot messages are:
Reading all physical volumes. This may take a while...
No volume groups found
No volume groups found
Begin: waiting for encrypted source device... ...

2. Boot of UNencrypted LVM RAID system hangs when disk is removed and replaced.
Last boot messages are repeated:
Incrementally starting RAID arrays...
mdadm: CREATE user root not found
mdadm: CREATE group disk not found
Incrementally started RAID arrays.

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


** Tags: raid trusty

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https://bugs.launchpad.net/bugs/1469269

Title:
  Degraded software RAID boot problems

Status in mdadm package in Ubuntu:
  New

Bug description:
  Please ignore bug report #1466803 as it is inaccurate - this replaces
  it.

  The Setup:
  VirtualBox 2 x 8GB disks
  Software RAID 1 or 10:
  md0 = 1GB /boot bootable
  md1 = 7GB LVM (1GB swap, 6GB root) - encrypted for (1) below so the initial setup looks like...

  for test 1:  Software RAID > encrypted volume > LVM
  for test 2:  Software RAID > LVM

  The issues (tested on VirtualBox with and on 14.04.2):

  1. Boot of encrypted LVM RAID system hangs when disk is removed.  
  Last boot messages are:
  Reading all physical volumes. This may take a while...
  No volume groups found
  No volume groups found
  Begin: waiting for encrypted source device... ...

  2. Boot of UNencrypted LVM RAID system hangs when disk is removed and replaced.
  Last boot messages are repeated:
  Incrementally starting RAID arrays...
  mdadm: CREATE user root not found
  mdadm: CREATE group disk not found
  Incrementally started RAID arrays.

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