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

[Tom Mercelis]

I started experiencing this problem on 12.04, it persisted after upgrading to 12.10 and even persisted after a clean install (on an empty partition) of 13.04. It also happens when I just boot from a USB stick with 13.04.
This is always with the same partitions.... and I'm guessing that might be part of the problem. These partitions were created years ago, and have different versions. The raid5 partition has 0.90 metadata, but the raid0 partition used as part of the raid5, has version 1.0 metadata. Could this cause the problem?
Still... isn't there anyone who can explain why the regular startup of Ubuntu fails to start these raids, and doing mdadm --stop on all devices and then running mdadm -A -s does succeed, even on a USB bootstick without any /edc/mdadm.conf?

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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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