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[dblade <listmail@xxxxxxxxxxxx>]

adding kernel parameter lvmwait=2 also works around this issue
(source of idea http://serverfault.com/questions/567579/boot-failure-with-root-on-md-raid1-lvm-udev-event-timing)

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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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