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

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.


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