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

[Itamar Heim]

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.