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

[Rachel Greenham]

thinking about it, when I tried that before i may have missed two
elements, both of which were probably necessary: The "AUTO -all" line to
prevent auto-assembly by scanning, and the update-initramfs step, as I
learnt about both of those things after I'd given up trying to do it
that way and was working on doing it the way I eventually ended up with.
:-)

As I understand then, it would merely be sufficient to do (assuming
older relevant lines are removed):

echo "AUTO -all" >> /etc/mdadm/mdadm.conf
mdadm --detail --scan >> /etc/mdadm/mdadm.conf
update-initramfs -u

I'm a bit wary of doing it on my system now, especially as it's in the
middle of a reshape, but I may try it later unless someone else reports
here that it doesn't work. :-)

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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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