[Bug 1635049] Re: Boot fails with degraded mdadm raid

[Dimitri John Ledkov]

On 5 April 2017 at 07:28, Eero <1635049 at bugs.launchpad.net> wrote:
> I just made a fresh install from ubuntu-16.04.2-server-amd64.iso,
> updated everything, and tested to boot without one disk. It failed. See
> the attachment for my RAID configuration.
>
> https://imgur.com/a/RApJS
>

Please open new a new bug report, instead of piling onto an unrelated
report.

And your boot is waiting for you to unlock the encrypted volume...
only after which the volume groups will be detected.

I do not see anything degraded in your case at all.

Note your test-case is completely different to this bug report as it
also involves encrypted volume.

Regards,

Dimitri.

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https://bugs.launchpad.net/bugs/1635049

Title:
  Boot fails with degraded mdadm raid

Status in mdadm package in Ubuntu:
  Fix Released
Status in mdadm source package in Xenial:
  Fix Released
Status in mdadm package in Debian:
  Fix Released

Bug description:
  [Impact]

   * Systems fail to boot in certain status of mdadm arrays, requiring
  manual recovery / array assembly

   * Backport of boot logic from yakkety

  [Test Case]

   * Install a system with RAID1 and two hard-drives and boot the system with array in-sync
   * Shutdown
   * Disconnect one of the drives and thus boot, unexpectedly, degraded
   * The boot should complete.
   * Shutdown, and boot again, expecting degraded state.
   * The boot should complete.
   * Shutdown, reconnect disconnected drive, and boot again.
   * The boot should complete, add the device to the array, the array should be resyncing, and results with system with array in-sync, just like at the beginning of the testcase.

  [Regression Potential]

   * Systems may continue to fail to boot degraded.

  [Other Info]

   * Original report

  mdadm does not attempt to start partial md devices (incremental
  assembly) during initramfs and can cause system to fail to initramfs
  prompt if rootfs on md.

  http://askubuntu.com/questions/789953/how-to-enable-degraded-raid1
  -boot-in-16-04lts

  Fixed in debian mdadm 3.4-2: https://bugs.debian.org/cgi-
  bin/bugreport.cgi?bug=784070

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