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Re: [libvirt] Associate a LUN as disk with WWNN/WWPN



On 2011年11月25日 18:49, Daniel P. Berrange wrote:
On Fri, Nov 25, 2011 at 06:42:42PM +0800, Osier Yang wrote:
On 2011年11月25日 18:28, Daniel P. Berrange wrote:
On Fri, Nov 25, 2011 at 04:55:02PM +0800, Osier Yang wrote:


<quote>
AFAIU libvirt needs a way to:

- Associate a virtual adapter WWN with a VM (in the VM xml)
- Learn to start a virtual adapter when the VM is started, and destroy the
   adapter when the VM is stopped.
- Possibly a way to associate a WWN with a scsi pool, to start / stop a
   virtual adapter with the pool.
</quote>

But afer thinking more, I'd think it might be not good idea:

As far as I could understand, the requirement of the BZ wants
a way to create/migrate a guest with NPIV. I'm goint to talk
create first,and migration then.

The desire to assocaite WWNN/WWPN with a VM is just one part of a more
general need to expand libvirt's SCSI support. Paulo started a design
thread on the subject a month or so back which sort of converged into
agreement:

https://www.redhat.com/archives/libvir-list/2011-October/msg01253.html


Yes, I read this thread before, but it looks to me Paolo was talking
about LUN, scsi host, and vHBA passthrough. It's a bit different
with what I'm trying to resolve (There is no passthrough here, but
about how to design a good workflow between virt-manager / Boxes
and libvirt for using (creating and migration ) a FC LUN as a normal
disk). The useful thing in the discussion of the thread may be
define the (v)HBA as a controller though.

Or I misunderstood something?

I've found that when people generally talk about associating iSCSI LUNs
with a guest, they have always been expecting SCSI LUN passthrough, or
passthrough of the entire iSCSI vHBA.

If we're considering a non-passthrough use case, then IMHO the problem
should be generalized to

   How do we associated a storage volume with a VM ?

ie not something that is specific to (i)SCSI.


Agreed, but as far as I understand about the storage, doesn't only
iSCSI need specific setting before use? e.g. For a LVM volume,
it doesn't need things like vHBA creating, zone & mask the LUN
with storage management tools.

Thanks
Osier



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