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Hi guys,

> "Summit feedback: Not doing R/O volumes due to the limited hypervisor
> that can support setting the volume to R/O, currently only KVM has
> this capability".


Hyper-V supports mounting R/O iSCSI volumes as well.

Alessandro


On May 13, 2013, at 13:22 , lzy.dev at gmail.com wrote:

> Hi All,
> 
> In https://etherpad.openstack.org/summit-havana-cinder-multi-attach-and-ro-volumes,
> I saw a comment there:
> "Summit feedback: Not doing R/O volumes due to the limited hypervisor
> that can support setting the volume to R/O, currently only KVM has
> this capability".
> 
> I agree there probably have some troubles cause R/O volumes support
> hard to implement.
> But maybe since I have not attended the summit, nova and cinder guys
> not notice there is a blueprint to plan to implement a cinder backend
> driver for glance
> (https://blueprints.launchpad.net/glance/+spec/glance-cinder-driver, I
> proposed), so I consider the R/O volumes support can be implemented
> gracefully.
> Under the case, the R/O volume stored in cinder will be created as an
> image, client can access it by glance via standard api, and nova can
> prepare the R/W image (base on R/O volume) for the instance normally.
> 
> And more, I consider the R/O volume support and cinder driver for
> glance is valuable  because on nova side we can give some code changes
> to allow nova prepare instance disk via particular COW mechanism base
> on particular cinder backend store capability with more efficiency
> way, such as efficient snapshot.
> 
> Thanks,
> Zhi Yan
> 
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