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

[Tom Mercelis]

No, adding rootdelay=180 doesn't solve the problem. I now have
configured the system not to start with a degraded array. Which results
in the boot process being interrupted by a initramfs/rescue shell. In
that shell I stop the raid (mdadm --stop /dev/md5) and re-assemble the
arrays: mdadm -A --scan, then exit the rescue shell and the system boots
fine with the raid fully operational and no hours of re-syncing. So it
seems to me that something affects the order in which the raid devices
are brought up. I've been trying different settings for the root delay,
even found some bios options to give the disks more time to start before
grub is started, but only manually stopping the degraded array and
reassembling the array from the rescue shell works so far.

Kind regards

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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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