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 <[email protected]> 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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