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Detach a boot volume


#1

I’ve an openstack server with no ephemeral volume, only two permanent volumes.
One of them is a (bootable) root volume. I choose this setup for the very purpose of extending this volume.

Now I want to resize the root volume but I can not.
Whether I shut-off or shelved the server, it seems impossible to detach this [persistent] volume storage, even though https://specs.openstack.org/openstack/nova-specs/specs/stein/approved/detach-boot-volume.html says it is.

When instance is shelved, attempts to detach the volume results in a 409 error-code.


#2

Replying myself, I got it running using openstack command-line client:
openstack server remove volume foo-server foo-data --os-compute-api-version 2.20

That --os-compute-api-version 2.20 is key here!
I think OVH should update Horizon to take that into account.


#3

Errata. This does work for common volume.
It fails for boot volumes.

Can't detach root device volume (HTTP 403) (Request-ID: req-xxx)
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