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:
------------
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
--------------
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
>
> <><>
>
> 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
>
> <><>
>
> cat /boot/grub/device.map shows:
> (hd0) /dev/vda
>
> <><>
>
> 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
>
> <><>
>
> 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.
>
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt@xxxxxxxxxx
> http://lists.centos.org/mailman/listinfo/centos-virt
>
--
<http://www.panline.net> *Nenad Opsenica, M.Sc.EE*
Panline - VTkom d.o.o.
Bulevar Mihajla Pupina 6, Novi Sad, Serbia
Tel: (+381 21) 47 222 40; fax: (+381 21) 47 222 41
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