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[Bug 1313169] [NEW] Ubuntu Trusty Tahr cannot boot on RAID5 array


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Raid array is three identical Western Digital Green series 500GB hard
drives on an NVIDIA controller set to RAID5 for a total of 1TiB
(931.52GB) storage.

Installation was done using the Ubuntu LiveCD.

Partitions on the filesystem was created beforehand using gparted. The
partition table is set up to be GPT with a 8MB bios_grub partition, a
256MB fat32 EFIBoot partition (not used for this setup, board does not
support EFI and is expected to boot from the bios_grub legacy
partition), a 4GB swap, 80GB root partition, and the rest for /home.
Then  the installer is invoked and the partitions are set up. GRUB is
told to install to the root of the RAID array in /dev/mapper . The
installation went flawlessly.

Upon reboot, GRUB loads as expected, and loads the kernel and initrd as
expected. However, the kernel gives up on waiting for the root partition
and drops to initramfs busybox. "dmesg|grep device" shows the following

device-mapper: table: 252:0: raid: unknown target type
device-mapper: ioctl: error adding target to table

Trying to invoke dmraid -a y results in the following error:
ERROR: device-mapper target type "raid" is not in the kernel
RAID set "nvidia_babddecf" was not activated.

nvidia_babddecf is the assigned volume name by the controller.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: bot-comment
Ubuntu Trusty Tahr cannot boot on RAID5 array
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