[Bug 1279741] Re: Degraded array check, may not do what it says it's doing

[Launchpad Bug Tracker]

** Branch linked: lp:~xnox/ubuntu/trusty/mdadm/dmraid2mdadm

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https://bugs.launchpad.net/bugs/1279741

Title:
  Degraded array check, may not do what it says it's doing

Status in “mdadm” package in Ubuntu:
  New

Bug description:
  Degraded array check in the initramfs currently does:
  mdadm --misc --scan --detail --test

  and checks the return code. I happen to be using Intel Matrix Raid
  (container type), thus as it happens the container, and arrays are
  already assembled -> all arrays active, one disk active, one spare and
  rebuilding. At this state mdadm --misc --scan --detail --test returns
  error code 2, but it is to late to do anything but simply use that
  active array and continue to boot...

  So degraded_array question should die.

  We should attempt starting arrays with --no-degraded a few times, and
  after a timeout assemble them with --run, and if we don't have enough
  drives to start the array only then fall through to initramfs recovery
  shell.

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