Virtio with Debian GNU/Linux Etch

Virtio with Debian GNU/Linux Etch

[Daniel Bareiro]

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Hi all!

I have some installations with Debian GNU/Linux Etch I'm migrating to
KVM. I just installed a kernel 2.6.26 from backports to use Virtio.

But when I try to boot the operating system, it can not find the vd*
device to mount the root filesystem. I made sure to change the
/etc/fstab using partitions vd* and using in the 'root' GRUB parameter
the vd corresponding partition. Just in case it were not loading the
module, I added 'virtioi-blk' in /etc/modules, but I keep getting the
same problem.

What could be the problem?


Thanks in advance for your replies.

Regards,
Daniel
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Re: Virtio with Debian GNU/Linux Etch

[Stefan Hajnoczi]

On Fri, Sep 17, 2010 at 5:56 PM, Daniel Bareiro <daniel-listas@gmx.net> wrote:
> I have some installations with Debian GNU/Linux Etch I'm migrating to
> KVM. I just installed a kernel 2.6.26 from backports to use Virtio.
>
> But when I try to boot the operating system, it can not find the vd*
> device to mount the root filesystem. I made sure to change the
> /etc/fstab using partitions vd* and using in the 'root' GRUB parameter
> the vd corresponding partition. Just in case it were not loading the
> module, I added 'virtioi-blk' in /etc/modules, but I keep getting the
> same problem.
>
> What could be the problem?

1. Check that your VM has the virtio PCI adapters present.  You can do
this by running lspci from a livecd/installer or grep 1af4
/proc/bus/pci/devices.  Look for PCI adapters with vendor ID 1af4 (Red
Hat).
2. Check that the virtio kernel modules are loaded by your initramfs.
Either check the kernel messages as it boots for virtio-pci or vd*
related messages.  Or get a debug shell in the initramfs and grep
virtio-pci /proc/bus/pci/devices.
3. Did you really mean 'virtoi-blk' in /etc/modules?  You can gunzip
and cpio extract the initramfs to check that virtio, virtio_pci,
virtio_ring, virtio_blk are present.

Stefan

Re: Virtio with Debian GNU/Linux Etch

[Daniel Bareiro]

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Hi, Zdenek.

El viernes 17 de septiembre del 2010 a las 23:11:58,
Zdenek Kaspar escribió:

> > I have some installations with Debian GNU/Linux Etch I'm migrating
> > to KVM. I just installed a kernel 2.6.26 from backports to use
> > Virtio.
> > 
> > But when I try to boot the operating system, it can not find the vd*
> > device to mount the root filesystem. I made sure to change the
> > /etc/fstab using partitions vd* and using in the 'root' GRUB
> > parameter the vd corresponding partition. Just in case it were not
> > loading the module, I added 'virtioi-blk' in /etc/modules, but I
> > keep getting the same problem.
> > 
> > What could be the problem?

> 1) try put virtio_pci and virtio_blk into /etc/initramfs-tools/modules
> and run update-initramfs

Great! Following these steps, the kernel boots without problems!

It draws attention to me that previous was not necessary to do with a
stock kernel 2.6.26 of Debian GNU/Linux Lenny wanting to switch from
using IDE disks to virtio disks.

> BTW, for next kernel package updates you should modify grub menu.lst:
> ie: # kopt=root=/dev/vda1 ro otherwise next kernel update
> (update-grub) will screw root parameter again if the entries were
> automatically generated..

Thanks for the recommendation.


Thanks to both for your replies.

Regards,
Daniel
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