Bug#575199: grub-pc: update-grub fails if /boot is mirrored with LVM

[Jim Studt]

Package: grub-pc
Version: 1.98-1
Severity: important

With my /boot partition on a mirrored LVM partition I get...
  root at host:/# update-grub
  Generating grub.cfg ...
  /usr/sbin/grub-probe: error: physical volume pv2 not found.
  root at host:/#
.... and no grub.cfg written.

Unmirroring the volume with "lvconvert -m0 ..." fixes it so update-grub 
will again work.

-- Package-specific info:

*********************** BEGIN /proc/mounts
/dev/mapper/sys-root / ext4 rw,relatime,errors=remount-ro,barrier=1,data=ordered 0 0
/dev/mapper/sys-boot /boot ext3 rw,relatime,errors=continue,data=ordered 0 0
/dev/mapper/sys-home /home ext4 rw,relatime,barrier=1,data=ordered 0 0
/dev/mapper/sys-tmp /tmp ext4 rw,relatime,barrier=1,data=ordered 0 0
/dev/mapper/sys-usr /usr ext4 rw,relatime,barrier=1,data=ordered 0 0
/dev/mapper/sys-var /var ext4 rw,relatime,barrier=1,data=ordered 0 0
/dev/mapper/sys-rattus /machines/rattus ext4 rw,relatime,barrier=1,data=ordered 0 0
*********************** END /proc/mounts

*********************** BEGIN /boot/grub/device.map
(hd0)	/dev/sda
*********************** END /boot/grub/device.map

*********************** BEGIN /boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by /usr/sbin/grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  load_env
fi
set default="0"
if [ ${prev_saved_entry} ]; then
  set saved_entry=${prev_saved_entry}
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z ${boot_once} ]; then
    saved_entry=${chosen}
    save_env saved_entry
  fi
}
insmod lvm
insmod ext2
set root='(sys-boot)'
search --no-floppy --fs-uuid --set d4066c12-cc13-4250-922e-c13dcfd06ab4
set locale_dir=($root)/grub/locale
set lang=en
insmod gettext
set timeout=5
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
menuentry "Debian GNU/Linux, with Linux 2.6.33.1" --class debian --class gnu-linux --class gnu --class os {
	insmod lvm
	insmod ext2
	set root='(sys-boot)'
	search --no-floppy --fs-uuid --set d4066c12-cc13-4250-922e-c13dcfd06ab4
	echo	Loading Linux 2.6.33.1 ...
	linux	/vmlinuz-2.6.33.1 root=/dev/mapper/sys-root ro  quiet
	echo	Loading initial ramdisk ...
	initrd	/initrd.img-2.6.33.1
}
menuentry "Debian GNU/Linux, with Linux 2.6.33.1 (recovery mode)" --class debian --class gnu-linux --class gnu --class os {
	insmod lvm
	insmod ext2
	set root='(sys-boot)'
	search --no-floppy --fs-uuid --set d4066c12-cc13-4250-922e-c13dcfd06ab4
	echo	Loading Linux 2.6.33.1 ...
	linux	/vmlinuz-2.6.33.1 root=/dev/mapper/sys-root ro single 
	echo	Loading initial ramdisk ...
	initrd	/initrd.img-2.6.33.1
}
menuentry "Debian GNU/Linux, with Linux 2.6.32-3-amd64" --class debian --class gnu-linux --class gnu --class os {
	insmod lvm
	insmod ext2
	set root='(sys-boot)'
	search --no-floppy --fs-uuid --set d4066c12-cc13-4250-922e-c13dcfd06ab4
	echo	Loading Linux 2.6.32-3-amd64 ...
	linux	/vmlinuz-2.6.32-3-amd64 root=/dev/mapper/sys-root ro  quiet
	echo	Loading initial ramdisk ...
	initrd	/initrd.img-2.6.32-3-amd64
}
menuentry "Debian GNU/Linux, with Linux 2.6.32-3-amd64 (recovery mode)" --class debian --class gnu-linux --class gnu --class os {
	insmod lvm
	insmod ext2
	set root='(sys-boot)'
	search --no-floppy --fs-uuid --set d4066c12-cc13-4250-922e-c13dcfd06ab4
	echo	Loading Linux 2.6.32-3-amd64 ...
	linux	/vmlinuz-2.6.32-3-amd64 root=/dev/mapper/sys-root ro single 
	echo	Loading initial ramdisk ...
	initrd	/initrd.img-2.6.32-3-amd64
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
	insmod lvm
	insmod ext2
	set root='(sys-boot)'
	search --no-floppy --fs-uuid --set d4066c12-cc13-4250-922e-c13dcfd06ab4
	multiboot	/memtest86+_multiboot.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
	insmod lvm
	insmod ext2
	set root='(sys-boot)'
	search --no-floppy --fs-uuid --set d4066c12-cc13-4250-922e-c13dcfd06ab4
	multiboot	/memtest86+_multiboot.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###
*********************** END /boot/grub/grub.cfg

-- System Information:
Debian Release: squeeze/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.33.1 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages grub-pc depends on:
ii  debconf [debconf-2.0]         1.5.28     Debian configuration management sy
ii  grub-common                   1.98-1     GRand Unified Bootloader, version 
ii  libc6                         2.10.2-6   Embedded GNU C Library: Shared lib
ii  ucf                           3.0025     Update Configuration File: preserv

grub-pc recommends no packages.

Versions of packages grub-pc suggests:
pn  desktop-base                  <none>     (no description available)

-- debconf information:
  grub-pc/kopt_extracted: false
  grub2/kfreebsd_cmdline:
  grub2/kfreebsd_cmdline_default: quiet
* grub-pc/install_devices: (hd0)
  grub-pc/postrm_purge_boot_grub: false
* grub2/linux_cmdline_default: quiet
  grub-pc/chainload_from_menu.lst: true
* grub2/linux_cmdline: