[Bug 136252] Re: [->UUIDudev] mdadm.conf w/o ARRAY lines but udev/mdadm not assembling arrays. (boot & hotplug fails)

[Davias]

Well, what you described is not standard upgrade procedure, as per Ubuntu. I did upgrade from 8.10, following Ubuntu directive, going to -> 9.04 ; reboot -> 9.10 ; reboot -> 10.04 LTS with my system on RAID1 and GRUB on both disks. That was a year ago and it is still working. 
Hope this can be of any help.

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https://bugs.launchpad.net/bugs/136252

Title:
  [->UUIDudev]  mdadm.conf w/o ARRAY lines but udev/mdadm not assembling
  arrays. (boot & hotplug fails)

Status in “mdadm” package in Ubuntu:
  In Progress

Bug description:
  Binary package hint: mdadm

  Hi,

  I could not boot from my /dev/md1 -> /dev/vg01/lv_root partition,
  because the initrd could not assemble the md0 and md1 devices. After
  reading mdadm.conf, I added these two lines to my config:

  # definitions of existing MD arrays
  ARRAY /dev/md0 devices=/dev/sda1,/dev/sdb1
  ARRAY /dev/md1 devices=/dev/sda5,/dev/sdb5

  and updated initramfs. After this, the system started normally. Before
  figuring out this, I used dpkg-reconfigure mdadm. So this seems to
  produce a non working config, which is copied to the initrd.

  Kind regards

  Christian

  -> However on hotplug systems mdadm.conf should not have to contain
  any references to specific DEVICEs, ARRAYs or HOMEHOST.

  -> We need to switch to a pure and secure UUID-based raid assembly.
  The boot up scripts already support and use UUIDs, but mdadm needs to
  be convinced (-> comment #42)