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[Mark Thornton <1351528@xxxxxxxxxxxxxxxxxx>]

See https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1077650

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

Title:
  boot fails for LVM on degraded raid due to missing device tables at
  premount

Status in “lvm2” package in Ubuntu:
  Confirmed

Bug description:
  This is a Trusty installation with combined root + /boot within LVM on top of mdraid (type 1.x) RAID1.  Raid1 was built with one missing disk (degraded).
  [method:  basically create raid/VG/LV setup in shell first then point installer at the lvm.  At the end of the install create a chroot, add the mdadm pkg, and update-initramfs before reboot.]

  The boot process 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 continued visibility of text 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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