[Bug 1318351] Re: mdadm doesn't assemble imsm raids during normal boot

[Dimitri John Ledkov]

On 11 May 2014 15:12, Martin Stjernholm <msub at stjernholm.org> wrote:
> Public bug reported:
>
> I have a non-root Intel "fakeraid" volume which is not getting assembled
> automatically at startup. I can assemble it just fine with "sudo mdadm
> --assemble --scan".
>
> While trying to debug this, I encountered that it is being assembled
> when I'm booting in debug (aka recovery) mode. It turns out that
> nomdmonisw and nomdmonddf are passed to the kernel during normal boot
> only, and this is due to /etc/default/grub.d/dmraid2mdadm.cfg
> containing:
>
> GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT nomdmonddf
> nomdmonisw"
>
> Commenting out that line fixes the problem.
>
> I've gathered that this is an effort to migrate from dmraid to mdadm for
> fakeraids. I don't understand how it's supposed to work, but in my case
> dmraid is not installed, and this setting is an interference. (The
> background is that I recently added a 3 TB raid1 and was therefore
> forced to abandon dmraid in favor of mdadm since the former doesn't
> handle volumes larger than ~2 TB. So I dropped dmraid and set up mdadm
> from scratch for this new raid.)
>
> Also, I believe it's a bug that these kernel arguments are different
> between normal and recovery boot.
>
> My mdadm is 3.2.5-5ubuntu4 in a fresh trusty install.
>

Correct, I think i should be able to adjust packaging such that no
changes are required when dmraid is not installed.
At the moment automatic conversion to mdadm is not performed, as
/etc/fstab is not automatically updated to modify device names from
dmraid naming scheme to mdadm naming scheme.
Once, that is in place i'll drop dmraid2mdadm.cfg file.


-- 
Regards,

Dimitri.


** Changed in: mdadm (Ubuntu)
       Status: New => Confirmed

** Changed in: mdadm (Ubuntu)
     Assignee: (unassigned) => Dimitri John Ledkov (xnox)

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https://bugs.launchpad.net/bugs/1318351

Title:
  mdadm doesn't assemble imsm raids during normal boot

Status in “mdadm” package in Ubuntu:
  Confirmed

Bug description:
  I have a non-root Intel "fakeraid" volume which is not getting
  assembled automatically at startup. I can assemble it just fine with
  "sudo mdadm --assemble --scan".

  While trying to debug this, I encountered that it is being assembled
  when I'm booting in debug (aka recovery) mode. It turns out that
  nomdmonisw and nomdmonddf are passed to the kernel during normal boot
  only, and this is due to /etc/default/grub.d/dmraid2mdadm.cfg
  containing:

  GRUB_CMDLINE_LINUX_DEFAULT="$GRUB_CMDLINE_LINUX_DEFAULT nomdmonddf
  nomdmonisw"

  Commenting out that line fixes the problem.

  I've gathered that this is an effort to migrate from dmraid to mdadm
  for fakeraids. I don't understand how it's supposed to work, but in my
  case dmraid is not installed, and this setting is an interference.
  (The background is that I recently added a 3 TB raid1 and was
  therefore forced to abandon dmraid in favor of mdadm since the former
  doesn't handle volumes larger than ~2 TB. So I dropped dmraid and set
  up mdadm from scratch for this new raid.)

  Also, I believe it's a bug that these kernel arguments are different
  between normal and recovery boot.

  My mdadm is 3.2.5-5ubuntu4 in a fresh trusty install.

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