[Bug 931929] Re: root on RAID:0 fails to boot

[Alexandre Paradis]

I wanted to add additional information to this bug.

The same problem exists for LVM VG groups not being activated before
initramfs-tools tries to mount an LVM root partition.

Specifically my issue occurred after reboot, after the update to Precise
(Ubuntu Server).  I got the "ALERT! /dev/mapper/my-root does not exist
Dropping to a shell!" error and sent back to initramfs prompt.

To fix the problem, I had to manually edit /usr/share/initramfs-tools/scripts/init-premount/lvm2 , and add the following line:
vgchange -ay

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https://bugs.launchpad.net/bugs/931929

Title:
  root on RAID:0 fails to boot

Status in tools for generating an initramfs:
  Confirmed
Status in udev - /dev/ management daemon:
  New
Status in “initramfs-tools” package in Ubuntu:
  Confirmed

Bug description:
  Once again booting from RAID is broken.

  There were similar bugs in Jaunty, Karmic, and Lucid.
  I don't recall encountering this error in Natty.
  It was definetly not present in Oneiric.

  Steps to reproduce:
  1. Upgrade to Precise (fresh install not tested, but likely has the same problem)
  2. Reboot
  3. Observe failure to find root and drop to busybox

  initramfs is not loading dmraid and therefore fails to boot.

  To work around this, when given the busybox prompt enter:

  dmraid -ay

  and verify that your raid devices are initialized, thn enter:

  exit

  and booting should continue.

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