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John this function is workable in Icehouse I believe, the Nova side
(for libvirt only) code has been merged in this cycle early.

I also had given the answer for this question at:
https://answers.launchpad.net/cinder/+question/243863

zhiyan

On Fri, Feb 14, 2014 at 1:10 PM, John Griffith
<john.griffith at solidfire.com> wrote:
> On Thu, Feb 13, 2014 at 7:54 PM, minmin ren <rmm0811 at gmail.com> wrote:
>> I found cinder havana version is added a new feature about the read-only
>> volume.
>> So I create a volume with setting volume metadata with key="readonly" and
>> value="True", and attached it to an instance.
>> However, it doesn't work. I can write data in volume.
>>
>> Any wrong with my steps?
>> How could I use the read-only volume?
>> Has been multi-attach readonly volume supported?
>>
>>
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> Unfortunately this isn't something that's usable at this point.  What
> you are seeing in the code are the beginnings of an effort that was
> started but never picked back up this cycle.  I'll have a look at
> where this is at but may revert the code for icehouse it's picked back
> up.  There's no API call specifically because we weren't ready to
> expose this yet.
>
> Thanks,
> John
>
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