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Old 11-16-2005, 03:02 PM   #1
LQ Newbie
Registered: Nov 2005
Posts: 2

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lvm2 booting - can't find ext3

Dear All,

I have Fedora Core 4.

I created a volume group called lvm-root.

In that volume group I created only one logical partition, called lvm0.

I mounted it and copied my current root filesystem there (using cp -ax).

I used mkinitrd 5.0.8 with the appropriate fstab file (see bottom) and the kernel
version 2.6.11-1.1369_FC4.

Booting from the cloned root filesystem (lvm0) was impossible as I got
the following error :

VFS: can't frin ext3 filesystem on dev ram0

Note : before that message I got the message that lvm-root was
successfully activated.

My fstab file is :
# This file is edited by fstab-sync - see 'man fstab-sync' for details
/dev/lvm-root/lvm0 / ext3 defaults,errors=remount-ro 1 1
none /dev/pts devpts gid=5,mode=620 0 0
none /dev/shm tmpfs defaults 0 0
none /proc proc defaults 0 0
none /sys sysfs defaults 0 0
LABEL=/tmp /tmp ext3 defaults 1 2
LABEL=SWAP-sda7 swap swap defaults 0 0
/dev/sda1 /media/windows_C ntfs ro,umask=0222 0 0

/dev/fd0 /media/floppy auto pamconsole,exec,noauto,managed 0 0
/dev/hda /media/cdrecorder auto pamconsole,exec,noauto,managed 0 0

My initrd's init script is :

mount -t proc /proc /proc
echo Mounting proc filesystem
echo Mounting sysfs filesystem
mount -t sysfs /sys /sys
echo Creating /dev
mount -o mode=0755 -t tmpfs /dev /dev
mkdir /dev/pts
mkdir /dev/shm
mkdir /dev/mapper
echo Creating initial device nodes
mknod /dev/console c 5 1
mknod /dev/null c 1 3
mknod /dev/ram b 1 1
mknod /dev/rtc c 10 135
mknod /dev/systty c 4 0
mknod /dev/tty c 5 0
mknod /dev/zero c 1 5
mknod /dev/tty0 c 4 0
mknod /dev/tty1 c 4 1
mknod /dev/tty2 c 4 2
mknod /dev/tty3 c 4 3
mknod /dev/tty4 c 4 4
mknod /dev/tty5 c 4 5
mknod /dev/tty6 c 4 6
mknod /dev/tty7 c 4 7
mknod /dev/tty8 c 4 8
mknod /dev/tty9 c 4 9
mknod /dev/tty10 c 4 10
mknod /dev/tty11 c 4 11
mknod /dev/tty12 c 4 12
mknod /dev/ttyS0 c 4 64
mknod /dev/ttyS1 c 4 65
mknod /dev/ttyS2 c 4 66
mknod /dev/ttyS3 c 4 67
echo Setting up hotplug.
echo -n /sbin/hotplug > /proc/sys/kernel/hotplug
echo Creating block device nodes.
echo "Loading scsi_mod.ko module"
insmod /lib/scsi_mod.ko
echo "Loading sd_mod.ko module"
insmod /lib/sd_mod.ko
echo "Loading libata.ko module"
insmod /lib/libata.ko
echo "Loading sata_nv.ko module"
insmod /lib/sata_nv.ko
echo "Loading jbd.ko module"
insmod /lib/jbd.ko
echo "Loading ext3.ko module"
insmod /lib/ext3.ko
echo "Loading dm-mod.ko module"
insmod /lib/dm-mod.ko
echo "Loading dm-mirror.ko module"
insmod /lib/dm-mirror.ko
echo "Loading dm-zero.ko module"
insmod /lib/dm-zero.ko
echo "Loading dm-snapshot.ko module"
insmod /lib/dm-snapshot.ko
echo Making device-mapper control node
echo Scanning logical volumes
lvm vgscan --ignorelockingfailure
echo Activating logical volumes
lvm vgchange -ay --ignorelockingfailure lvm-root
resume LABEL=SWAP-sda7
echo Creating root device.
mkrootdev -t ext3 -o defaults,errors=remount-ro,ro /dev/lvm-root/lvm0
echo Mounting root filesystem.
mount /sysroot
echo Setting up other filesystems.
echo Switching to new root and running init.

Thanks in advance
Old 11-16-2005, 05:02 PM   #2
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Registered: Oct 2003
Location: /earth/usa/nj (UTC-5)
Distribution: RHL9;F1-10; CentOS4-5; DebianSarge-Squeeze
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You need to move /boot to a non-LVM partition. Grub cannot look inside an LVM.
Old 11-18-2005, 05:02 PM   #3
LQ Newbie
Registered: Nov 2005
Posts: 2

Original Poster
Rep: Reputation: 0
lvm2 booting - can't find ext3

Dear WhatsHisName,

The actual boot process is indeed initiated from an non-lvm partition. This is my grub.conf :

title Fedora Core (2.6.11-1.1369_FC4)
root (hd0,5)
kernel /boot/vmlinuz-2.6.11-1.1369_FC4 ro root=LABEL=/ rhgb quiet
initrd /boot/initrd-2.6.11-1.1369_FC4.img
title Fedora Core (2.6.11-1.1369_FC4) 2
root (hd0,8)
kernel /vmlinuz-2.6.11-1.1369_FC4 root=/dev/ram0 rhgb quiet
initrd /initrd-lvm2-2.6.11-1.1369_FC4.img
title Windows XP (SP2)
rootnoverify (hd0,0)

It boots, activates the volgroup and then it says that it cannot find an ext3 filesystem which I suppose its the root filesystem. My partition table is the following

Disk /dev/sda: 37.0 GB, 37019566080 bytes
255 heads, 63 sectors/track, 4500 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 3040 24418768+ 86 NTFS volume set
/dev/sda2 3041 4500 11727450 f W95 Ext'd (LBA)
/dev/sda5 4102 4114 104391 7 HPFS/NTFS
/dev/sda6 3519 4101 4682884+ 83 Linux
/dev/sda7 4115 4245 1052226 82 Linux swap / Solaris
/dev/sda8 4246 4500 2048256 83 Linux
/dev/sda9 3041 3042 16033+ 83 Linux
/dev/sda10 3043 3518 3823438+ 8e Linux LVM

As you can see, the Linux LVM partition (/dev/sda10), where the root filesystem lies, is after the /dev/sda9 where the initrd, the kernel and the rest stuff that boot the system lie. Indeed the /dev/sda9 is in the grub.conf the (hd0,8). Thank you for your help


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