[Bug 452350] Re: Unknown LVM metadata header

Thu Jul 12 04:13:54 UTC 2012

pvremove could not find the device in my case.  It said "Couldn't find
device. Check your filters?"  with -ff and "Physical Volume /dev/sda5
note found" without -ff.   pvck and pvscan were of no use identifying
the label, however I knew that I had moved LVM from /dev/sda5 to
/dev/sda6 using the alternate installer (similar to comments above).

I found this post below and was able to see the label myself.
http://www.redhat.com/archives/linux-lvm/2008-February/msg00011.html

dd if=/dev/sda5 bs=1k count=1 | hexdump -e '"%_p"'

so there it is.  but when I use pvremove -vvvv /dev/sda5 I can see the
"Skipping md component device" rule being applied.  How do I turn this
off??

Interestingly, I have another device that is a raid device, that has LVM
on it, and it looks the same, so I get how grub2 is getting confused.

The solution was to turn md detection off in /etc/lvm/lvm.conf and re-
run the pvremove command.   The labels were "successfully wiped".

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https://bugs.launchpad.net/bugs/452350

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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