[ovirt-users] Using Virtio-SCSI passthough on SCSI - Devices

[Jeremiah Jahn]

looks like libvirt should be able to do it with it's hostdev entries.

http://libvirt.org/formatdomain.html#elementsHostDevSubsys

<devices>
    <hostdev mode='subsystem' type='scsi'>
      <source>
        <adapter name='scsi_host0'/>
        <address type='scsi' bus='0' target='0' unit='0'/>
      </source>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </hostdev>
  </devices>
  ...

On Sat, Apr 26, 2014 at 4:09 AM, Itamar Heim <iheim at redhat.com> wrote:
> On 04/25/2014 08:01 PM, Daniel Helgenberger wrote:
>>
>>
>> On Fr, 2014-04-25 at 17:19 +0200, Jiri Belka wrote:
>>>
>>> On Fri, 25 Apr 2014 13:40:09 +0000
>>> Daniel Helgenberger <daniel.helgenberger at m-box.de> wrote:
>>>
>>>> Hello,
>>>>
>>>> does anyone have an idea on how to accomplish this? In my particular
>>>> setup, I need a FC tape drive passed though to the vm.
>>>> Note, passing throuh FC - LUNs works flawlessly.
>>>>
>>>> If I understood Virtio -SCSI correctly, this should be possible from
>>>> libvirt's part.
>>>
>>>
>>> I can be wrong but my understanding is that dm-mpio works on block
>>> layer thus it does not support multipath for tapes/cd-devices.
>>>
>>> But I could be wrong, I got this info from an OpenBSD paper comparing
>>> SCSI multipath implementation.
>>>
>>> j.
>>
>> No, I think so too - it does not support tape drive as such (but I could
>> set up a tape library as a LUN to use it with LTFS for instance)
>>
>> The point being is another. VirtIO SCSI should be able to pass through
>> any scsi device; like tape drives end enclosures. I know this works in
>> Proxmox: http://pve.proxmox.com/wiki/Tape_Drives
>>
>> Does it work in oVirt, too? In the GUI I only see block LUNs from DM.
>
>
> i suggest you try making it work via libivrt first, then we can compare to
> the xml passed to the guest, workaround with a custom hook, etc.
>
>
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