[Libguestfs] Changing a given image from virtio-blk to virtio-scsi

[Yaniv Kaul]

On Thu, Jul 14, 2016 at 9:03 PM, Richard W.M. Jones <rjones at redhat.com>
wrote:

> On Thu, Jul 14, 2016 at 06:54:20PM +0300, Yaniv Kaul wrote:
> > Any idea what 'virt-customize' script I should use to convert from
> > virtio-blk (vda, vdb...) to virtio-scsi (sda, sdb...) ?
>
> You'll find that you have to recreate the initrd, else it won't boot
> (I'm assuming this is a Linux guest).
>
> This is somewhat complicated and involves running some commands from
> the guest.  Here's what virt-v2v does, although virt-v2v is especially
> complicated because it supports doing this for everything back to RHEL 3(!)
> You probably only need to run dracut if you only care about modern
> Fedora & RHEL.
>
>
> https://github.com/libguestfs/libguestfs/blob/master/v2v/convert_linux.ml#L794-L921
>
> > I've tried naively to convince libvirt to use virtio-scsi and still
> present
> > it to the guest as 'vd*' - that didn't work (
>
> Yeah the target dev names in libvirt XML aren't really arbitrary
> strings.  Device names are controlled by the *guest* kernel, nothing
> to do with the host which just exports one or another PCI device.
>
> Rich.
>

Does it make more sense to just use virt-builder and build it from scratch?
I did not find where in virt-builder I can actually specify virtio-scsi as
the type.
(BTW, the reason for all this is mainly to get 'discard' support...)
Y.


> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
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>
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