[Bug 1466803] Re: Multiple Software RAID problems on 14.04.2

[Gareth]

A correction to point 2 in my original report - degraded unencrypted LVM
RAID boots but fails to boot when a new virtual disk is atatched
(without first declaring the removed one as faulty, to simulate a
hardware failure)

To reproduce:

Install Ubuntu Server 14.04.2 in VirtualBox with two 8GB  virtual disks - all formats ext4 where required:
Partition each drive:
1GB bootable RAID 10  - md0
7GB RAID 10 - md1

/boot on md0
LVM on md1 (1GB swap, 6GB root)
Finish installation and restart, apply latest updates. Shutdown
Remove one of the virtual drives in VirtualBox
Boot fails

With the encrypted version (RAID 10 > LUKS > LVM) boot fails after
installation.

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Title:
  Multiple Software RAID problems on 14.04.2

Status in mdadm package in Ubuntu:
  New

Bug description:
  Re. mdadm 3.2.5-5ubuntu4.1 (or possibly kernel bug(s)?)

  Firstly,

  /etc/initramfs-tools/conf.d/mdadm does not seem to exist as it is
  suggested it should in the official server guide.

  1. Encrypted LVM RAID fails to boot
  2. LVM RAID fails to boot when degraded

  I have had various issues re. (2) tested with VirtualBox and KVM (with
  and on 14.04.2)

  (1) gets so far in the boot process then keeps displaying "No volume groups found"
  (2) if virtual disk is removed from the VM, I've managed to get it to boot once and remove the offending disk from mdX using mdadm ... but couldn't reproduce this behaviour a second (or third) time - now it just keeps printing...

  Incrementally starting RAID arrays...
  mdadm: CREATE user root not found
  mdadm: CREATE group disk not found
  Incrementally started RAID arrays

  ...every few seconds.

  That symptom seems to be fixable in other reports in circumstances
  where the system is bootable after a soft reset (Ctrl+Alt+Del) but no
  such luck in my case.

  It seems that software RAID is a mess in 14.04 - can someone take a
  good look at it?

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