Hi Ken,
grub is a bit tricky to install in such setup. Try to use following script from within host machine - this works for me:
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losetup /dev/loop0 /dev/YOUR_VG/YOUR_LV kpartx -av /dev/loop0
ln -fs /dev/mapper/loop0p1 /dev/loop01 grub --device-map=/dev/null <<-END device (hd0) /dev/loop0 root (hd0,0) setup (hd0) END rm -f /dev/loop01 kpartx -dv /dev/loop0 losetup -d /dev/loop0
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Best regards,
Nenad
Ken Bass wrote:
I have a virtual machine that had been running fine using a RAW disk image (IDE).
I am in the process of converting this virtual machine to use a single LVM and virtio. (For LVM backup snapshots and easy resizing purposes (no LVM within the guest))
I create the LVM and copied all the files from the existing RAW image to an ext3 under the LVM.
However, I cannot get it to boot. It has to do with GRUB and I cannot figure out why the stupid thing is not working as it should.
I boot the guest using the Centos 5.5 DVD and select Rescue and chroot /mnt/sysimage
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fdisk -l shows:
Disk /dev/vda: 21.4 GB, 21474836480 bytes 213 heads, 34 sectors/track, 5791 cylinders Units = cylinders of 7242 * 512 = 3707904 bytes
Device Boot Start End Blocks Id System/dev/vda1 1 5792 20970496 83 Linux
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cat /boot/grub/device.map shows: (hd0) /dev/vda
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However grub cannot find the /boot/grub/stage1.
I ran grub and did the following:
device (hd0) /dev/vda OK
root (hd0,0) Filesystem type is ext2fs, partition type 0x83
setup (hd0)
Checking if "/boot/grub/stage1" exists... no Checking if "/grub/stage1" exists... no Error 2: Bad file or directory type
find /boot/grub/stage1 Error 15: File not found
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However, there is most definitely a /boot/grub/stage1 in the (hd0,1) - I copied the entire boot directory from the RAW IDE image to the LVM. Even 'find /sbin/init' fails. Now find works at all.
My host is Fedora 14.
What is odd is that I created a different virtual machine by going through the whole Centos 5.5 DVD Install process and that one works. In this non working case, I've copied the files over to the LVM and it seems GRUB is the only issue/difference. I can boot the DVD installed one and run the above grub find command and it finds the stage1 fine.
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