[one-users] VM quotas and priorities?

[Javier Fontan]

I am not familiar with VMWare nomenclature but from what I see in
those documents reservation relates to the minimun cpu available for a
VM. That feature is directly related on how the hypervisor manages VMs
(hypervisor scheduler). Our xen drivers use the ammount of CPU you
specify (e.g. 0.5) to set credits in the xen credit scheduler [1]. We
use a fair share scheduling (weight), not capping the maximun cpu a VM
can consume. When VM's are competing to use CPU resoirces this values
are use to enforce fair share of available CPU. If there is no
overcommitment then that CPU value will set the minimun cpu a VM could
use.

I really could not understand the priority part but the document
linked mentioned IO prioritization. If that is the case it is not
supported out of the box but take into account that OpenNebula is
modular and easily modified extended. I think that IO throttling can
be accomplished adding ionice calls on VM creation.

[1] http://wiki.xensource.com/xenwiki/CreditScheduler

On Wed, Feb 9, 2011 at 8:32 PM, Ivan Voras <ivoras at gmail.com> wrote:
> On 9 February 2011 17:00, Javier Fontan <jfontan at gmail.com> wrote:
>> OpenNebula supports changing scheduling policies [1] using rank and
>> requirements parameters in the template file [2]. There's also a quota
>> system implemented for cpu and memory [3] but is can be easily
>> modified to cope with more resource constraints [4].
>>
>> [1] http://opennebula.org/documentation:rel2.0:schg
>> [2] http://opennebula.org/documentation:rel2.0:template#Placement_Section
>> [3] http://opennebula.org/documentation:rel2.0:users
>> [4] http://opennebula.org/documentation:rel2.0:auth
>
> Thanks for your reply; I've found the MM scheduler and per-user quotas
> but what I'm trying to found out is if there is something like
> VMWare's reservations and priorities, see e.g. page 78 of:
>
> http://www.vmware.com/pdf/vsphere4/r41/vsp_41_vm_admin_guide.pdf
>
> (docs home at http://www.vmware.com/support/pubs/vs_pages/vsp_pubs_esxi41_i_vc41.html).
>
>> On Tue, Feb 8, 2011 at 7:32 PM, Ivan Voras <ivoras at gmail.com> wrote:
>>> Hello,
>>>
>>> We are trying to evaluate OpenNebula and one of the things we are
>>> looking into is the possibility of configuring priorities and quotas
>>> to CPU, network and disk IO. Of course, these are just a wishlist.
>>>
>>> I haven't found any documentation that would suggest that OpenNebula
>>> supports these features - maybe I've missed something?
>>> _______________________________________________
>>> Users mailing list
>>> Users at lists.opennebula.org
>>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
>>>
>>
>>
>>
>> --
>> Javier Fontan, Grid & Virtualization Technology Engineer/Researcher
>> DSA Research Group: http://dsa-research.org
>> Globus GridWay Metascheduler: http://www.GridWay.org
>> OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org
>>
>



-- 
Javier Fontan, Grid & Virtualization Technology Engineer/Researcher
DSA Research Group: http://dsa-research.org
Globus GridWay Metascheduler: http://www.GridWay.org
OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org