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[dblade <listmail@xxxxxxxxxxxx>]

The primary difference that I see for degraded boot is this error just ahead of activating volume group 'dataone'
'watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange -a y''(err) '  device-mapper: reload ioctl on  failed: Invalid argument'

and also after that point the 55-dm and 56-lvm rules do not fire and
create the device setup like what happens in the _normal.txt log.

If anyone does compare these logs you can search for the volume group
name 'dataone' on both files to see what I am referring to.

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https://bugs.launchpad.net/bugs/1351528

Title:
  boot fails on degraded raid (mdraid) due to LVM root (combined / +
  /boot) missing device tables at mount time

Status in “lvm2” package in Ubuntu:
  New

Bug description:
  Trusty installation is combined root + /boot within LVM on top of mdraid (type 1.x) RAID1 with one missing disk (degraded).
  [method:  basically create the setup in shell first then point install at the lvm.  at end of install create a chroot and add mdadm pkg]

  boot fails with the following messages:
   Incrementally starting RAID arrays...
   mdadm: CREATE user root not found
   mdadm: CREATE group disk not found
   Incrementally starting RAID arrays...
  and slowly repeats the above at this point.

  workaround:
  - add break=premount to grub kernel line entry
  - for continue visibility of boot output also remove quiet,  splash and possibly set gxmode 640x480

  now @ initramfs prompt:
  mdadm --detail /dev/md0 should indicate a state of clean, degraded, array is started so this part is ok

  lvm lvs output attributes are as follows:
  -wi-d----  (instead of the expected -wi-a----)
  lvs manpage this means device tables are missing (device mapper?)

  FIX: simply run lvm vgchange -ay and exit initramsfs.  This will lead
  to a booting system.

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