Re: [Xen-devel] [PATCH v5 3/5] libxl: add support for vscsi

[Juergen Gross <jgross@xxxxxxxx>]

On 05/15/2015 10:47 AM, Ian Campbell wrote:
> On Fri, 2015-05-15 at 07:58 +0200, Olaf Hering wrote:
> > On Fri, May 15, JÃrgen Groà wrote:
> >
> > > Multi-LUN devices do exist and they are required to be presented as
> > > those to the guest.
> > Ok, this means we need the bus concept. I will see if the API for
> > add/remove can be changed that only devices get passed to the libxl.
> Does a multi-LUN device require it's own bus or something?
>
> Or do the LUN numbers need to be passed through to the guest because
> things get upset otherwise?
>
> IOW why does multi-LUN imply multi-bus, and even if so why does that
> need to be exposed to the user?
These are e.g. RAID-systems or tape libraries. In most cases one LUN
is a control LUN via which the other LUNs can be configured and/or
administrated. This implies that all of those LUNs have to share the
same target and they need to have the same LUN numbers in the guest as
on the real device.


Juergen

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