[Bug 990913] Re: RAID goes into degrade mode on every boot 12.04 LTS server

[Tom Mercelis]

That's correct, one of the 3 devices is another array. But this setup
worked in previous Ubuntu releases. If I remember correctly I created
the array in Ubuntu 10.04, and it has since worked in 11.04 and 11.10.
It's always been the same array, I know that at least once it was a
"clean" new install (new root partition), and from 11.10 to 12.04 was an
upgrade in the same root partition.

So something must have changed in the startup scripts that start the
arrays for the root device; or in md. And the fact that I can still get
it working by re-assembling the array in rescue shell, make me believe
it's in the scripts.

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https://bugs.launchpad.net/bugs/990913

Title:
  RAID goes into degrade mode on every boot 12.04 LTS server

Status in “mdadm” package in Ubuntu:
  Confirmed

Bug description:
  I have 2 new Dell PowerEdge R515.
  Box have 2 internal SAS drives and 12 hot swap
  I create a 12 driver raid 6 array on the 12 hot swap drives
  without problem but on every reboot I get a message about 
  either degraded or not enough drives for the raid 6.

  If I shutdown and pull all 12 drives and let boot. Then plug them in.
  The array comes up fine most everytime.

  This happens on both of these new R512

  Also loaded 12.04 LTS server on a R710 and
  the mpt2sas load and times out. I had to
  add rootdelay=180 to boot parms.

  Description:    Ubuntu 12.04 LTS
  Release:        12.04

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