[Bug 1274320] Re: Error: diskfilter writes are not supported

[Søren Høyer Kristensen]

I just installed Ubuntu Server 14.04 the other day and got the same error. 
Configuration was:

2x1tb hdd's
512Mb efiboot partition on each disk
The rest was setup as a raid partition (on both disks), before linking them in a raid 1 array

On top of that raid 1 array I setup LVM, with a LVM group and virtual volumes such as the following:
swap
root ( mounted as / )

I thought a linux software raid 1 array + LVM was the way to go, but
after reading #67, if I understand it correctly, there is no plans for
an official fix in future Ubuntu versions or patches? Due to security
issues? Should we just forget about LVM then, if we want to mirror our
disks with raid 1?

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https://bugs.launchpad.net/bugs/1274320

Title:
  Error: diskfilter writes are not supported

Status in GRand Unified Bootloader:
  Unknown
Status in grub2 package in Ubuntu:
  Triaged
Status in mdadm package in Ubuntu:
  Invalid
Status in grub2 package in Debian:
  New
Status in grub2 package in Fedora:
  Unknown

Bug description:
  Once grub chooses what to boot to, an error shows up and will sit on
  the screen for approx. 5 seconds

  "Error: diskfilter writes are not supported.
  Press any key to continue..."

  From what I understand, this error is related to raid partitions, and
  I have two of them (md0, md1). Both partitions are used (root and
  swap). Raid is assembled with mdadm and are raid0

  This error message started appearing right after grub2 was updated on
  01/27/2014.

  System:    Kernel: 3.13.0-5-generic x86_64 (64 bit) Desktop: KDE 4.11.5 Distro: Ubuntu 14.04 trusty
  Drives:    HDD Total Size: 1064.2GB (10.9% used)
          1: id: /dev/sda model: SanDisk_SDSSDRC0 size: 32.0GB
          2: id: /dev/sdb model: SanDisk_SDSSDRC0 size: 32.0GB
          3: id: /dev/sdc model: ST31000528AS size: 1000.2GB
  RAID:      Device-1: /dev/md1 - active raid: 0 components: online: sdb2 sda3 (swap)       Device-2: /dev/md0 - active raid: 0 components: online: sdb1 sda1 ( / )
  Grub2:    grub-efi-amd64 version 2.02~beta2-5

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: grub-efi-amd64 2.02~beta2-5
  ProcVersionSignature: Ubuntu 3.13.0-5.20-generic 3.13.0
  Uname: Linux 3.13.0-5-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Wed Jan 29 17:37:59 2014
  SourcePackage: grub2
  UpgradeStatus: Upgraded to trusty on 2014-01-23 (6 days ago)

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