[Bug 452350] Re: Unknown LVM metadata header

Wed Jul 25 13:48:33 UTC 2012

I've been bitten too. I have a software RAID 10, /dev/md0, which is made
up of /dev/sd[a-d]2. /dev/md0 is the only "physical" volume in a volume
group. Looking at the first two sectors of /dev/sd[a-d]2, there are
indeed volume group manager labels, but this is as I would expect:
they're holding data for the first two sectors of /dev/md0  — the md
driver's overhead loses a little space at the end of the volume, but
none at the beginning. If I point pvck at /dev/sd[a-d]2, it correctly
ignores them, as they're part of an md device. I'm not about to zap
these labels, as I think they're valid. Could the problem be that
update-grub (and, incidentally, the boot process, where one can see the
same error message flitting by) is not as smart as mdadm, and is not
ignoring partitions that are claimed by an md device?

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Title:
  Unknown LVM metadata header

Status in “grub2” package in Ubuntu:
  Confirmed
Status in “grub2” package in Debian:
  Confirmed

Bug description:
  Binary package hint: grub2

  update-grub2 appears to run successfully, but generates a lot of
  "error: Unknown LVM metadata header" messages in the process. LVM was
  created during install on a clean system (using ubuntu-9.10-beta-
  alternate-i386.iso).

  $ sudo update-grub2
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  Generating grub.cfg ...
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  Found linux image: /boot/vmlinuz-2.6.31-14-generic
  Found initrd image: /boot/initrd.img-2.6.31-14-generic
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header
  Found linux image: /boot/vmlinuz-2.6.31-11-generic
  Found initrd image: /boot/initrd.img-2.6.31-11-generic
  error: Unknown LVM metadata header
  error: Unknown LVM metadata header

  Here's some extra info that may help:

  $ mount
  /dev/mapper/root-root on / type ext4 (rw,noatime,errors=remount-ro)
  proc on /proc type proc (rw)
  none on /sys type sysfs (rw,noexec,nosuid,nodev)
  none on /sys/fs/fuse/connections type fusectl (rw)
  none on /sys/kernel/debug type debugfs (rw)
  none on /sys/kernel/security type securityfs (rw)
  udev on /dev type tmpfs (rw,mode=0755)
  none on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
  none on /dev/shm type tmpfs (rw,nosuid,nodev)
  none on /var/run type tmpfs (rw,nosuid,mode=0755)
  none on /var/lock type tmpfs (rw,noexec,nosuid,nodev)
  none on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
  /dev/sda1 on /boot type ext2 (rw,noexec,nosuid,nodev,noatime)

  $ ls -la /boot
  total 26783
  drwxr-xr-x  4 root root    1024 2009-10-15 11:27 .
  drwxr-xr-x 22 root root    4096 2008-11-18 16:28 ..
  -rw-r--r--  1 root root  628340 2009-09-25 05:18 abi-2.6.31-11-generic
  -rw-r--r--  1 root root  629174 2009-10-15 01:09 abi-2.6.31-14-generic
  -rw-r--r--  1 root root  111218 2009-09-25 05:18 config-2.6.31-11-generic
  -rw-r--r--  1 root root  111371 2009-10-15 01:09 config-2.6.31-14-generic
  drwxr-xr-x  2 root root    3072 2009-10-15 11:58 grub
  -rw-r--r--  1 root root 7297493 2008-11-17 15:49 initrd.img-2.6.31-11-generic
  -rw-r--r--  1 root root 7283454 2009-10-15 11:27 initrd.img-2.6.31-14-generic
  drwxr-xr-x  2 root root   12288 2008-11-17 15:24 lost+found
  -rw-r--r--  1 root root  128796 2009-09-28 05:17 memtest86+.bin
  -rw-r--r--  1 root root 1657331 2009-09-25 05:18 System.map-2.6.31-11-generic
  -rw-r--r--  1 root root 1664737 2009-10-15 01:09 System.map-2.6.31-14-generic
  -rw-r--r--  1 root root    1196 2009-09-25 05:21 vmcoreinfo-2.6.31-11-generic
  -rw-r--r--  1 root root    1196 2009-10-15 01:12 vmcoreinfo-2.6.31-14-generic
  -rw-r--r--  1 root root 3873888 2009-09-25 05:18 vmlinuz-2.6.31-11-generic
  -rw-r--r--  1 root root 3890400 2009-10-15 01:09 vmlinuz-2.6.31-14-generic

  $ sudo sfdisk -l /dev/sda

  Disk /dev/sda: 974 cylinders, 255 heads, 63 sectors/track
  Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

     Device Boot Start     End   #cyls    #blocks   Id  System
  /dev/sda1   *      0+     30      31-    248976   83  Linux
  /dev/sda2         31     973     943    7574647+  8e  Linux LVM
  /dev/sda3          0       -       0          0    0  Empty
  /dev/sda4          0       -       0          0    0  Empty

  ProblemType: Bug
  Architecture: i386
  Date: Thu Oct 15 11:59:41 2009
  DistroRelease: Ubuntu 9.10
  Package: grub-pc 1.97~beta4-1ubuntu1
  ProcEnviron:
   LANG=C
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-14.47-generic
  SourcePackage: grub2
  Uname: Linux 2.6.31-14-generic i686

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