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On 2/27/2019 7:41 PM, Zhenyu Zheng wrote:
> There is something I don't quite understand, what will be different for 
> the volumes that are newly attached and
> the existing volumes in case you mentioned? I mean, the existing volumes 
> could also have tags, and when
> we unshelve,  we still have to handle the tags in bdms, no matter it is 
> existing bdms or newly atteched when the
> instance is in ``shelved_offloaded`` status. What is the difference?

There isn't, it's a bug:

https://bugs.launchpad.net/nova/+bug/1817927

Which is why I think we should probably lift the restriction in the API 
so that users can attach volumes with tags to a shelved offloaded instance.

I'm not really comfortable with adding root volume detach/attach support 
if the user cannot specify a new tag when attaching a new root volume, 
and to do that we have to remove that restriction on tags + shelved 
offloaded servers in the API.

-- 

Thanks,

Matt