[Bug 952063] [NEW] Cannot boot server using mdadm RAID1 after creating LVM snapshot

[Roger Hunwicks]

Public bug reported:

I'm running a test server on Precise to act as a KVM host. The virtual
machines are using LVM logical volumes as backing stores. I have created
several virtual machines by taking an LVM snapshot of a base image. When
I rebooted the server, it no longer boots.

After switching grub to use the console I get messages similar to the
ones reported here: http://www.redhat.com/archives/linux-
lvm/2012-February/msg00032.html - i.e. "Snapshot cow pairing for
exception table handover failed"

The server has 2 2TB SATA drives - partitioned into a smallish sdX1 and
a large sdX5. sda1/sdb1 make a mdadm RAID 1 array md0, sda2/sdb2 make
md0. Both md devices are clean. md0 contains vgSystem with logical
volumes for root, boot and swap. md1 contains vgVMs with logical volumes
for all the virtual machines.

I can boot the server of a USB stick and then assemble the md arrays and
enable the volume groups and everything seems intact

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: grub-pc 1.99-17ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Sun Mar 11 11:16:44 2012
InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120130)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: grub2 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/952063

Title:
  Cannot boot server using mdadm RAID1 after creating LVM snapshot

Status in “grub2” package in Ubuntu:
  New

Bug description:
  I'm running a test server on Precise to act as a KVM host. The virtual
  machines are using LVM logical volumes as backing stores. I have
  created several virtual machines by taking an LVM snapshot of a base
  image. When I rebooted the server, it no longer boots.

  After switching grub to use the console I get messages similar to the
  ones reported here: http://www.redhat.com/archives/linux-
  lvm/2012-February/msg00032.html - i.e. "Snapshot cow pairing for
  exception table handover failed"

  The server has 2 2TB SATA drives - partitioned into a smallish sdX1
  and a large sdX5. sda1/sdb1 make a mdadm RAID 1 array md0, sda2/sdb2
  make md0. Both md devices are clean. md0 contains vgSystem with
  logical volumes for root, boot and swap. md1 contains vgVMs with
  logical volumes for all the virtual machines.

  I can boot the server of a USB stick and then assemble the md arrays
  and enable the volume groups and everything seems intact

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: grub-pc 1.99-17ubuntu1
  ProcVersionSignature: Ubuntu 3.2.0-18.28-generic 3.2.9
  Uname: Linux 3.2.0-18-generic x86_64
  ApportVersion: 1.94.1-0ubuntu2
  Architecture: amd64
  Date: Sun Mar 11 11:16:44 2012
  InstallationMedia: Ubuntu-Server 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120130)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: grub2
  UpgradeStatus: No upgrade log present (probably fresh install)

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