[openstack-dev] [nova] do not account compute resource of instances in state SHELVED_OFFLOADED

John Garbutt john at johngarbutt.com
Sun Jan 31 17:57:04 UTC 2016

On 27 January 2016 at 16:59, Sascha Vogt <sascha.vogt at gmail.com> wrote:
> Hi Andrew,
> Am 27.01.2016 um 10:38 schrieb Andrew Laski:
>> 1. This allows for a poor experience where a user would not be able to
>> turn on and use an instance that they already have due to overquota.
>> This is a change from the current behavior where they just can't create
>> resources, now something they have is unusable.
> That is a valid point, though I think if it's configurable it is up to
> the operator to use that feature.

We need to make sure we don't have configuration values that change
the semantic of our API.
Such things, at a minimum, need to be discoverable, but are best avoided.

>> 2. I anticipate a further ask for a separate quota for the number of
>> offloaded resources being used to prevent just continually spinning up
>> and shelving instances with no limit.  Because while disk/ram/cpu
>> resources are not being consumed by an offloaded instance network and
>> volume resources remain consumed and storage is required is Glance for
>> the offloaded disk.  And adding this additional quota adds more
>> complexity to shelving which is already overly complex and not well
>> understood.
> I think an off-loaded / shelved resource should still count against the
> quota being used (instance, allocated floating IPs, disk space etc) just
> not the resources which are no longer consumed (CPU and RAM)

OK, but that does mean unshelve can fail due to qutoa. Maybe thats OK?

> In addition I think it would make sense to introduce a quota for Glance
> and ephemeral disk size and a shelved instance could (should) still
> count against those quotas.

The quota really should live with the project that owns the resource.
i.e. nova has the "ephemeral" disk quota, but glance should have the
glance quota.


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