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Florian-

You can definitely delete a flavor [1].

Don't worry about it affecting existing instances that were created with
that flavor: nova stores a copy of the flavor with the instance itself
so the information is preserved.

Thanks for the question!

-efried

[1]
https://docs.openstack.org/nova/latest/admin/flavors.html#delete-a-flavor

On 3/29/19 10:43 AM, Florian Engelmann wrote:
> Hi,
> 
> I would like to retire old flavors we don't want to be use any more. I
> guess deleting is the wrong way to retire flavors? I was not able to
> find any documentation about how the life-cycle of a flavor works.
> 
> Any help is very welcome.
> 
> All the best,
> Florian