Bug#598441: grub-pc: Grub doesn't cope with Root on LVM and LVM Mirrored disk for /home
Tim Bray
tim at kooky.org
Tue Sep 28 22:50:14 UTC 2010
Package: grub-pc
Version: 1.98+20100804-4
Severity: important
My system has 3 disks.
1 Intel SSD 80G
2 x SATA normal disks 1TB each.
Intention is to have the system boot of the SSD but use the normal disks for /home (mirrored)
It works fine until I mirror /home
There are two LVM volumes:
timdeb/root (this is on the SSD)
timdeb/home (this is just on one disk)
I then mirror the disks by issuing:
# lvconvert -m1 /dev/timdeb/home
Confirm mirror using:
# lvs -a -o +devices
LV VG Attr LSize Origin Snap% Move Log Copy% Convert Devices
home timdeb mwi-ao 100.00g home_mlog 100.00 home_mimage_0(0),home_mimage_1(0)
[home_mimage_0] timdeb iwi-ao 100.00g /dev/sdb1(0)
[home_mimage_1] timdeb iwi-ao 100.00g /dev/sdc1(0)
[home_mlog] timdeb lwi-ao 4.00m /dev/sda1(4608)
root timdeb -wi-ao 18.00g /dev/sda1(0)
# update-grub
Generating grub.cfg ...
/usr/sbin/grub-probe: error: no such disk.
Doesn't work.
If I then unmirror the disk:
####
root at timdeb:~# lvconvert -m0 /dev/timdeb/home
root at timdeb:~# lvs -a -o +devices
LV VG Attr LSize Origin Snap% Move Log Copy% Convert Devices
home timdeb -wi-ao 100.00g /dev/sdb1(0)
root timdeb -wi-ao 18.00g /dev/sda1(0)
####
Then update grub works fine
####
root at timdeb:~# update-grub
Generating grub.cfg ...
Found background image: moreblue-orbit-grub.png
Found linux image: /boot/vmlinuz-2.6.32-5-amd64
Found initrd image: /boot/initrd.img-2.6.32-5-amd64
done
root at timdeb:~#
####
Then it all works fine.
If the disks are mirrored, then system will not boot. It drops to grub rescue mode. Fix is to use a rescue CD and un-mirror the disks. Then system boots straight away.
There is something about have a mirrored lvm disk which upsets grub.
-- Package-specific info:
*********************** BEGIN /proc/mounts
/dev/mapper/timdeb-root / reiserfs rw,nodiratime,relatime,data=writeback 0 0
/dev/mapper/timdeb-home /home reiserfs rw,nodiratime,relatime,data=writeback 0 0
*********************** END /proc/mounts
*********************** BEGIN /boot/grub/device.map
(hd0) /dev/disk/by-id/ata-INTEL_SSDSA2M080G2GC_CVPO01700518080JGN
(hd1) /dev/disk/by-id/ata-ST31000528AS_9VP8EHGA
(hd2) /dev/disk/by-id/ata-ST31000528AS_9VP8EQ7B
*********************** END /boot/grub/device.map
*********************** BEGIN /boot/grub/grub.cfg
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#
### BEGIN /etc/grub.d/00_header ###
insmod lvm
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="${chosen}"
save_env saved_entry
fi
}
function load_video {
insmod vbe
insmod vga
insmod video_bochs
insmod video_cirrus
}
insmod lvm
insmod part_msdos
insmod part_msdos
insmod part_msdos
insmod reiserfs
set root='(timdeb-root)'
search --no-floppy --fs-uuid --set 5cb49c5f-3bd8-41f3-99f3-8a5e99086ea2
if loadfont /usr/share/grub/unicode.pf2 ; then
set gfxmode=640x480
load_video
insmod gfxterm
fi
terminal_output gfxterm
insmod lvm
insmod part_msdos
insmod part_msdos
insmod part_msdos
insmod reiserfs
set root='(timdeb-root)'
search --no-floppy --fs-uuid --set 5cb49c5f-3bd8-41f3-99f3-8a5e99086ea2
set locale_dir=($root)/boot/grub/locale
set lang=en
insmod gettext
set timeout=1
### END /etc/grub.d/00_header ###
### BEGIN /etc/grub.d/05_debian_theme ###
insmod lvm
insmod part_msdos
insmod part_msdos
insmod part_msdos
insmod reiserfs
set root='(timdeb-root)'
search --no-floppy --fs-uuid --set 5cb49c5f-3bd8-41f3-99f3-8a5e99086ea2
insmod png
if background_image /usr/share/images/desktop-base/moreblue-orbit-grub.png ; then
set color_normal=black/black
set color_highlight=magenta/black
else
set menu_color_normal=cyan/blue
set menu_color_highlight=white/blue
fi
### END /etc/grub.d/05_debian_theme ###
### BEGIN /etc/grub.d/10_linux ###
menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-amd64' --class debian --class gnu-linux --class gnu --class os {
insmod lvm
insmod part_msdos
insmod part_msdos
insmod part_msdos
insmod reiserfs
set root='(timdeb-root)'
search --no-floppy --fs-uuid --set 5cb49c5f-3bd8-41f3-99f3-8a5e99086ea2
echo 'Loading Linux 2.6.32-5-amd64 ...'
linux /boot/vmlinuz-2.6.32-5-amd64 root=/dev/mapper/timdeb-root ro panic=5 quiet rootflags=data=writeback quiet
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.32-5-amd64
}
menuentry 'Debian GNU/Linux, with Linux 2.6.32-5-amd64 (recovery mode)' --class debian --class gnu-linux --class gnu --class os {
insmod lvm
insmod part_msdos
insmod part_msdos
insmod part_msdos
insmod reiserfs
set root='(timdeb-root)'
search --no-floppy --fs-uuid --set 5cb49c5f-3bd8-41f3-99f3-8a5e99086ea2
echo 'Loading Linux 2.6.32-5-amd64 ...'
linux /boot/vmlinuz-2.6.32-5-amd64 root=/dev/mapper/timdeb-root ro single panic=5 quiet rootflags=data=writeback
echo 'Loading initial ramdisk ...'
initrd /boot/initrd.img-2.6.32-5-amd64
}
### END /etc/grub.d/10_linux ###
### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###
### 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 ###
### BEGIN /etc/grub.d/41_custom ###
if [ -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
*********************** END /boot/grub/grub.cfg
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing'), (50, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/6 CPU cores)
Locale: LANG=en_GB.ISO-8859-15, LC_CTYPE=en_GB.ISO-8859-15 (charmap=ISO-8859-15)
Shell: /bin/sh linked to /bin/dash
Versions of packages grub-pc depends on:
ii debconf [debconf-2.0] 1.5.35 Debian configuration management sy
ii grub-common 1.98+20100804-5 GRand Unified Bootloader, version
ii libc6 2.11.2-6 Embedded GNU C Library: Shared lib
ii libdevmapper1.02.1 2:1.02.48-3 The Linux Kernel Device Mapper use
ii ucf 3.0025+nmu1 Update Configuration File: preserv
grub-pc recommends no packages.
Versions of packages grub-pc suggests:
ii desktop-base 5.0.6 common files for the Debian Deskto
-- debconf information:
grub2/kfreebsd_cmdline:
grub2/device_map_regenerated:
* grub2/linux_cmdline: panic=5 quiet rootflags=data=writeback
* grub-pc/install_devices_empty: true
grub-pc/install_devices_failed: false
grub-pc/chainload_from_menu.lst: true
grub-pc/kopt_extracted: false
* grub-pc/install_devices:
grub-pc/postrm_purge_boot_grub: false
grub-pc/install_devices_failed_upgrade: true
grub-pc/disk_description:
grub2/kfreebsd_cmdline_default: quiet
grub-pc/partition_description:
grub-pc/install_devices_disks_changed:
grub2/linux_cmdline_default: quiet
grub-pc/mixed_legacy_and_grub2: true
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