[Bug 942106] Re: software raid doesn't assemble before mount on boot

[Mark Ovens]

I only use the mdadm array for data, i.e. I don't boot from them. I was
originally subscribed to one of the duplicate bugs. The problem I had
was that booting would stop with a message about the disks not being
ready and the option to 'S'kip or 'M'anual.

To work round this I added the `noauto` option to the /etc/fstab entry
for the array and called mount(8) in /etc/rc.local

My testing of this fix has simply being to remove the `noauto` option
from /etc/fstab and the call to mount(8) in /etc/rc.local.

I guess that this is not enough for those who boot from an array?

P.S. I am happy to try anything else you may require, but I'm away for 8
days from tomorrow.

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https://bugs.launchpad.net/bugs/942106

Title:
  software raid doesn't assemble before mount on boot

Status in “mdadm” package in Ubuntu:
  Fix Released
Status in “update-manager” package in Ubuntu:
  Fix Released
Status in “mdadm” source package in Precise:
  Fix Committed
Status in “update-manager” source package in Precise:
  Fix Released
Status in “mdadm” source package in Quantal:
  Fix Released
Status in “update-manager” source package in Quantal:
  Fix Released

Bug description:
  [IMPACT]

   * Due to small time-outs udev may not detect all attached drives
  quick enough to be processed and assembled into a RAID array

  * This results in dropping a user into an initramfs shell or if
  BOOT_DEGRADED is set the boot will proceed degrading RAID unnecessary

   * The fix is to include wait_for_udev call to give udev more time to
  find the drives which are part of RAID

  [TESTCASE]

   * Install RAID preferably with a "slow" interface, e.g. RAID1 with
  one drive on external USB

  * Reboot multiple times and notice that sometimes boot fails

  * Upgrade to the -proposed package

  * Reboot multiple times and notice that boot fail less often

  [Regression Potential]

  * boot speed is decreased due to the nature of the fix, i.e. adding a physical delay
  * Multiple reports in this bug and on the ubuntuforums reporting that this change "fixes" the boot issue for the users

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