I am trying to get a custom Centos 5 image going under Openstack Nova (a cloud framework). Trouble I have is that for whatever reason virtio storage doesn't work for me. For example if the VM is started using these options

<os> <type>hvm</type>

<kernel>/opt/nova-state/instances/instance-00000045/kernel</kernel> <cmdline>root=/dev/vda console=ttyS0</cmdline>

<initrd>/opt/nova-state/instances/instance-00000045/ramdisk</initrd> </os>

<disk type='file'> <driver type='qcow2'/> <source file='/opt/nova-state/instances/instance-00000045/disk'/> <target dev='vda' bus='virtio'/> </disk>

Booting fails

Creating root device. Mounting root filesystem. mount: could not find filesystem '/dev/root'

If I then destroy the VM, change root to be /dev/sda and target dev=sda with bus=ide things boot properly. Kernel and ramdisk being used to boot are these

vmlinuz-2.6.18-194.26.1.0.1.el5 initrd-2.6.18-194.26.1.0.1.el5.img

I even tried Oracle's 2.6.32 kernels with same results.

Underlying host OS is Oracle EL 5.5

Any clues ?

Vladimir