[openstack-dev] [nova] Do any hyperviors allow disk reduction as part of resize ?

Daniel P. Berrange berrange at redhat.com
Tue Jun 17 15:42:40 UTC 2014

On Tue, Jun 17, 2014 at 04:32:36PM +0100, Pádraig Brady wrote:
> On 06/13/2014 02:22 PM, Day, Phil wrote:
> > I guess the question I’m really asking here is:  “Since we know resize down won’t work in all cases,
> > and the failure if it does occur will be hard for the user to detect,
> > should we just block it at the API layer and be consistent across all Hypervisors ?”
> +1
> There is an existing libvirt blueprint:
>   https://blueprints.launchpad.net/nova/+spec/libvirt-resize-disk-down
> which I've never been in favor of:
>   https://bugs.launchpad.net/nova/+bug/1270238/comments/1

All of the functionality around resizing VMs to match a different
flavour seem to be a recipe for unleashing a torrent of unfixable
bugs, whether resizing disks, adding CPUs, RAM or any other aspect.

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