[Bug 1320402] Re: mdadm resyncs imsm raid in "Normal" state

[Sergio Callegari]

To me, this is highly critical. If you cannot use mdadm to manage RAID
on dual boot systems that need the imsm metadata (and obviously you
cannot if it means paying the price of constant resyncing) then you need
to resort to dmraid, which is very badly maintained and fails to
properly resync finalizing the dm state whenever the bios thinks that
the array is in a "verify" state (whatever it means).

Now, please do not underestimate the need to dual boot. Even machines
that are on Linux 99.9% of the time may need to boot the OS they were
sold with to do things like bios updates (either on the motherboard or
on some of their components) or to be able to call in the manufacturer
for assistance in case of failures.

** Bug watch added: Red Hat Bugzilla #753335
   https://bugzilla.redhat.com/show_bug.cgi?id=753335

** Also affects: mdadm (Fedora) via
   https://bugzilla.redhat.com/show_bug.cgi?id=753335
   Importance: Unknown
       Status: Unknown

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Title:
   mdadm resyncs imsm raid in "Normal" state

Status in mdadm package in Ubuntu:
  Confirmed
Status in mdadm package in Fedora:
  Unknown

Bug description:
  Got an imsm raid1 which I don't boot from. Whenever bios reports the
  raid as being in "Normal" state, mdadm starts a resync of it after
  boot. If a resync already is underway (bios reports it as being in
  "Verify" state), it continues where it left off.

  This appears to be very similar to a problem in Fedora:
  https://bugzilla.redhat.com/show_bug.cgi?id=753335 It's apparently
  fixed there for some time now. (The workaround mentioned in comment 41
  in that ticket doesn't work in Ubuntu, but I guess that's due to
  distro differences in initramfs and systemd.)

  Using mdadm 3.2.5-5ubuntu4 in a fresh Trusty install.

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