virtio-scsi with libvirt

[Ian Pilcher]

Can anyone point me to an example of using libvirt XML to create a
virtio-scsi disk?  I haven't been able to find anything anywhere.

Thanks!

-- 
========================================================================
Ian Pilcher                                         arequipeno(a)gmail.com
Sometimes there's nothing left to do but crash and burn...or die trying.
========================================================================

[Andrew Cathrow]

----- Original Message -----
>  From: "Ian Pilcher" <arequipeno(a)gmail.com&gt;
>  To: virt(a)lists.fedoraproject.org
>  Sent: Friday, January 4, 2013 7:08:14 PM
>  Subject: [fedora-virt] virtio-scsi with libvirt
>  
>  Can anyone point me to an example of using libvirt XML to create a
>  virtio-scsi disk?  I haven't been able to find anything anywhere. 
something like ...

Add the controller 
<controller type='scsi' index='0' model='virtio-scsi'>
 <alias name='scsi0'/>
</controller>


And then the the disk ...

    <disk type='block' device='disk'>
      <driver name='qemu' type='raw'/>
      <source dev='/dev/sdg'/>
      <target dev='sda' bus='scsi'/>
      <alias name='scsi0-0-0-0'/>
    </disk>











>  
>  Thanks!
>  
>  --
>  ========================================================================
>  Ian Pilcher
>                                          arequipeno(a)gmail.com
>  Sometimes there's nothing left to do but crash and burn...or die
>  trying.
>  ========================================================================
>  
>  _______________________________________________
>  virt mailing list
>  virt(a)lists.fedoraproject.org
>  https://admin.fedoraproject.org/mailman/listinfo/virt

[Ian Pilcher]

On 01/05/2013 02:13 PM, Andrew Cathrow wrote:
>  something like ...
>  
>  Add the controller 
>  <controller type='scsi' index='0' model='virtio-scsi'>
>   <alias name='scsi0'/>
>  </controller>
>  
>  
>  And then the the disk ...
>  
>      <disk type='block' device='disk'>
>        <driver name='qemu' type='raw'/>
>        <source dev='/dev/sdg'/>
>        <target dev='sda' bus='scsi'/>
>        <alias name='scsi0-0-0-0'/>
>      </disk> 
Yup.  I finally stumbled on section 12.3.3 of the RHEL Virtualization
Administration Guide, which got me going:

https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_Linux/6...

Note that I didn't have to specify the alias for the controller, I just
added "<controller type='scsi' model='virtio-scsi'
index='0'/>", and
libvirt did the rest.  I haven't tested yet, but it looks like it will
be possible to use virt-manager to add SCSI disks once the controller
has been added.

Now to see if my virtual RHEV hypervisors can use these as "Fibre
Channel" storage.

-- 
========================================================================
Ian Pilcher                                         arequipeno(a)gmail.com
Sometimes there's nothing left to do but crash and burn...or die trying.
========================================================================

[Ian Pilcher]

On 01/05/2013 02:30 PM, Ian Pilcher wrote:
>  Note that I didn't have to specify the alias for the controller,
> I just
>  added "<controller type='scsi' model='virtio-scsi'
> index='0'/>", and
>  libvirt did the rest.  I haven't tested yet, but it looks like it will
>  be possible to use virt-manager to add SCSI disks once the controller
>  has been added.
>  
>  Now to see if my virtual RHEV hypervisors can use these as "Fibre
>  Channel" storage. 
For anyone living vicariously through my virtualized RHEV experiment:

1.  Get a life!

2.  The answers are YES and YES.  Once the virtio-scsi controller has
    been added to a guest by editing the XML, SCSI disks can be added
    through the virt-manager GUI.  And RHEV is perfectly happy to use a
    shared virtio-scsi disk as "Fibre Channel" storage.

It seems that there's no documentation on adding virtio-scsi *disks* out
there, because adding the controller is the only tricky part (for a very
small value of tricky).

-- 
========================================================================
Ian Pilcher                                         arequipeno(a)gmail.com
Sometimes there's nothing left to do but crash and burn...or die trying.
========================================================================

[Richard W.M. Jones]

On Mon, Jan 07, 2013 at 01:16:28AM -0600, Ian Pilcher wrote:
>  On 01/05/2013 02:30 PM, Ian Pilcher wrote:
>  > Note that I didn't have to specify the alias for the controller, I just
>  > added "<controller type='scsi' model='virtio-scsi'
> index='0'/>", and
>  > libvirt did the rest.  I haven't tested yet, but it looks like it will
>  > be possible to use virt-manager to add SCSI disks once the controller
>  > has been added.
>  > 
>  > Now to see if my virtual RHEV hypervisors can use these as "Fibre
>  > Channel" storage.
>  
>  For anyone living vicariously through my virtualized RHEV experiment:
>  
>  1.  Get a life!
>  
>  2.  The answers are YES and YES.  Once the virtio-scsi controller has
>      been added to a guest by editing the XML, SCSI disks can be added
>      through the virt-manager GUI.  And RHEV is perfectly happy to use a
>      shared virtio-scsi disk as "Fibre Channel" storage.
>  
>  It seems that there's no documentation on adding virtio-scsi *disks* out
>  there, because adding the controller is the only tricky part (for a very
>  small value of tricky). 
A bit late in the day, but you can also compare and contrast how
libguestfs adds virtio-scsi controllers/disks:

https://github.com/libguestfs/libguestfs/blob/master/src/launch-libvirt.c

Rich.

-- 
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