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

[Rachel Greenham]

fwiw i found a workaround. first i thought it might involve containers
but i couldn't get those working at all. so i cheated.

eg: (compressed process, took place more incrementally)

mdadm --create /dev/md/vol0 --level=0 --raid-devices=2 /dev/sda /dev/sdb
mdadm --create /dev/md/vol1 --level=0 --raid-devices=2 /dev/sdc /dev/sdd
mdadm --create /dev/md/vol2 --level=linear --raid-devices=2 /dev/sde /dev/sdf

(thus three 3T arrays created; already have 3 3T single drives too):

mdadm --create /dev/md/Vault --level=5 --raid-devices=6 /dev/sdg
/dev/sdh /dev/sdi /dev/md/vol0 /dev/md/vol1 /dev/md/vol2

(and put a filesystem on it):

mkfs.ext4 -L Vault (other-options) /dev/md/Vault

(I think you got that far already. This is the workaround):

echo "AUTO -all" >> /etc/mdadm/mdadm.conf

(don't automatically assemble any arrays, just those listed in
mdadm.conf. Specifically):

mdadm --detail --scan | grep vol >> /etc/mdadm/mdadm.conf

(So, we only assemble the sub-arrays automatically during normal mdadm
startup)

Then into /etc/rc.local:

mdadm --assemble --config=partitions --scan

(*now* auto-enable any other arrays you can. /dev/md/Vault gets
assembled then.)

sleep 10

(probably excessive delay to make sure it's assembled

mount -L Vault -o rw,nosuid,nodev,relatime,uhelper=udisks2 /media/Vault

so yeah, you can't have Vault mounted in fstab because the array isn't
created in mdadm startup; so this *is* a workaround but it *does* 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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