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

[Xebec]

12.04.1 with all updated.This bug still affects me too!

My setup is the following: 4 LUKS encrypted partitions with mdadm RAID5
on top. The reason I encrypted first and then added them into the array
was based on performance: 4 threads doing encryption/decryption instead
of just 1. The max speed of this array vs Raid5 first, encrypt later is
169 MB/s vs 90 MB/s. This setup used to work perfectly in 9.10, but
stopped working in 12.04. mdadm always thinks the array is degraded. I
hope this bug is fixed!

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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 Released
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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