[one-users] can user's RAM quota acount only running/active VMs?

Tue May 13 15:37:02 PDT 2014

Yes, there maybe a problem. There won't be nothing to stop the scheduler
from allocating the VM if it's resumed. That's the reason for accounting
the capacity even if you are not actually using it, you'll be granted with
it as soon you request it (and its available).

So you may be not making a "complete" use of the resource them but you have
a "reservation" for them, especially for SUSPENDED/POWER OFF. But also for
HOLD, PENDING, STOP, that will potentially interfere with other users when
the VM is resumed.

Now we could check the quota when the VM is moved to PENDING. For example,
OpenNebula won't let you resume the VM.

However, the other quotas should be also modified to follow the same
convention. For example, number of IP's leased from a network. The main
problem I see here is that would be conflicting with other metrics like
(number of VMs). If we only limit ACTIVE VMs a DoS attack could be done
easily by creating VMs in STOP (e.g. size of checkpoint files is implicitly
controlled by the MEMORY quota). If we preserve the quota as in 4.6, then
the MEMORY quota for ACTIVE VMs wouldn't be useful.

Maybe is not "fair" in all cases (I believe that only stop VMs are a
problem, and that operation is not exposed for the end-users, i.e. cloud
view ) but it is consistent for all the quotas...

Cheers

Ruben

On Tue, May 13, 2014 at 11:15 PM, Jon <three18ti at gmail.com> wrote:

> How would that affect scheduling? For instance I have a vm that only comes
> on at certain times of the day.
>
> I think this is a good change too, I'm just curious if there are any
> repercussions to the change.
>
> Thanks,
> Jon A
> On May 13, 2014 2:04 PM, "kiran ranjane" <kiran.ranjane at gmail.com> wrote:
>
>> +1 vote for this
>>
>> Thanks
>>
>> Kiran Ranjane
>>
>>
>> On Tue, May 13, 2014 at 3:05 PM, Stefan Kooman <stefan at bit.nl> wrote:
>>
>>> Quoting Carlos Martín Sánchez (cmartin at opennebula.org):
>>> > Hi,
>>> >
>>> > On Fri, May 2, 2014 at 10:51 PM, Liu, Guang Jun (Gene) <
>>> > Gene.Liu at alcatel-lucent.com> wrote:
>>> >
>>> > >  Hi there,
>>> > >
>>> > > Is there a way to config or twist OpenNebula so that quota management
>>> > > (e.g. RAM) counts resources of active VMs only?
>>> > >
>>> > > I found the quota management (RAM per user) counts all the VMs which
>>> > > created by a user. We found if the quota only counts the resources
>>> from the
>>> > > active VMs, that means more sense. E.g., I have 16RAM quota. I
>>> create one
>>> > > VM w/ 16G RAM. Then I save/stop my VM. The system should allow me to
>>> create
>>> > > another VM w/ 16G RAM if quota management counts only active VMs.
>>> > >
>>> > > Thanks!
>>> > > Gene
>>> > >
>>> >
>>> > There isn't a way to configure that. It would require to modify the
>>> core.
>>> >
>>> > But I think it makes sense. So I return the question to the community:
>>> > ¿Should we consider this change in the quota behaviour?
>>>
>>> I vote for this change. Your not actually consuming resources on the
>>> hypervisor(s) for not having running vm's ...
>>>
>>> Gr. Stefan
>>>
>>> --
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>>
>>
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> Ruben S. Montero, PhD
> Project co-Lead and Chief Architect<http://lists.opennebula.org/listinfo.cgi/users-opennebula.org>
> OpenNebula - Flexible Enterprise Cloud Made Simple
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