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Re: [libvirt] [PATCH v3 4/7] qemu: Translate the iscsi pool/volume disk source



Il 24/07/2013 13:03, Daniel P. Berrange ha scritto:
>> Can you make the pool active, but at the same time not expose it as
>> devices on the host?  LUNs can be discovered by talking directly to the
>> target (similar to the iscsi-ls command included with libiscsi).
> 
> I've never considered that actually. From the API POV, what we need to
> know is the list of LUNS and their sizes. We don't require that they
> have files visible in the host - for example the VMWare storage pool
> impls don't expose files on the host.
> 
> So adding a mode for the pool which let you enumerate LUNs, but not
> expose them in the FS would be an option.
> 
>> In other words, perhaps mode='host' vs. mode='direct' could be a
>> property of the pool rather than the disk?  That would certainly work
>> fine for me.
> 
> It doesn't neccessarily need to be exclusive. If the pool used
> mode='host' we could still allow mode=host|direct in the guest. Only
> if the pool used mode=direct, would have to restrict it to mode=direct
> in the guest.  We could make the guest config setting for "mode"
> default to match the pool's config.

Cool!  Sounds like a plan.

libvirt itself could use libiscsi to support discovery for mode='direct'
pools.

Paolo


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