[Bug 728435] Re: raid1 boot degraded mode fails

[Thiago Martins]

Double posting here:

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So, brand new Ubuntu 14.04 and, impossible to boot it in degraded mode...

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I just install a server with:

/dev/sda1 = /dev/md0 = /boot
/dev/sda2 = /dev/md1 = LVM VG: vg01 = LVM LV: swap / LVM LV: root (ext4)

/dev/sdb not present.

Installation finishes without any problem, system doesn't boot.

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If I do not use LVM, like this:

/dev/sda1 = /dev/md0 = /
/dev/sda2 = SWAP

Ubuntu also doesn't boot (in degraded)...

I also tried this:

/dev/sda1 = /dev/md0 = /boot
/dev/sda2 = /dev/md1 = /
/dev/sda3 = SWAP

Doesn't boot either.

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This problem have nothing to do with LVM on top of raid1...

Come on guys, I'm a "Ubuntu Evangelist" but, problems like this are a
shame. Sorry, I don't want to be rude... Sad, but true.

Regards,
Thiago
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https://bugs.launchpad.net/bugs/728435

Title:
  raid1 boot degraded mode fails

Status in “mdadm” package in Ubuntu:
  Fix Released
Status in “mdadm” source package in Natty:
  Fix Released

Bug description:
  Binary package hint: debian-installer

  Doing the server default+raid1 test, disconnecting drive 2 causes boot
  to fail.

  mdadm find the good drive, and detects the missing drive but doesn't
  create the md devices.

  Screen dump:
  Attempting to start the RAID in degraded mode...
  mdadm: CREATE user root not found
  mdadm: CREATE group disk not found
  Could not start the RAID in degraded mode.
  Gave up waiting for root device. Common problems:
  ...
  ...
  ALERT! /dev/disk/by-uuid/1da...... does not exist.
  Dropping to a shell!

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