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On Tue, Aug 6, 2019 at 7:44 AM Sean Mooney <smooney at redhat.com> wrote:
>
> On Tue, 2019-08-06 at 10:47 +0000, Engelmann Florian wrote:
> > Hi,
> >
> > I would like to edit flavors which we created with 0 disk size. Flavors with a disk size (root volume) of 0 are not
> > handled well with, eg. Magnum. So I would like to add a root disk size to those flavors. The default precedure is to
> > delete them and recreate them. But that's not what I want. I would like to edit them, eg in the database. Is there any
> > possible impact on running instances using those flavors? I guess resize will work?
>
> Flavor with disk 0 are intended to be used with boot form volume guests if mangnum does not support boot form volume
> guest then it should not use those flavors.

FYI:

https://review.opendev.org/#/c/621734/

> if you edit it in the db it will not update the embeded flavor in the instnce record.
> it may result in host being over substibed and it will not update the allocations in placement to reflect the new size.
>
> a resize should fix that but if you are using boot form volume be aware that instance will be schdule based
> on the local disk space available on the compute nodes so if you are using boot form volume it will not work as
> expected.  your best solution assuming you are using local storage is to create a new flavor and do a resize.
>
> >
> > All the best,
> > Florian
>
>


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