Open Stack

On Tue, 2014-04-08 at 10:49 +0000, Day, Phil wrote:
> On a large cloud you’re protect against this to some extent if the
> number of servers is >> number of instances in the quota.
> 
> However it does feel that there are a couple of things missing to
> really provide some better protection: 
> 
> -         A quota value on the maximum size of a server group
> -         A policy setting so that the ability to use service-groups
> can be controlled on a per project basis 

Alternately, we could just have the affinity filters serve as weighting
filters instead of returning NoValidHosts.

That way, a request containing an affinity hint would cause the
scheduler to prefer placing the new VM near (or not-near) other
instances in the server group, but if no hosts exist that meet that
criteria, the filter simply finds a host with the most (or fewest, in
case of anti-affinity) instances that meet the affinity criteria.

Best,
-jay

> From: Khanh-Toan Tran [mailto:khanh-toan.tran at cloudwatt.com] 
> Sent: 08 April 2014 11:32
> To: OpenStack Development Mailing List (not for usage questions)
> Subject: Re: [openstack-dev] [Nova] Hosts within two Availability
> Zones : possible or not ?
> 
> “Abusive usage” : If user can request anti-affinity VMs, then why
> doesn’t he uses that? This will result in user constantly requesting
> all his VMs being in the same anti-affinity group. This makes
> scheduler choose one physical host per VM. This will quickly flood the
> infrastructure and mess up with the objective of admin (e.g.
> Consolidation that regroup VM instead of spreading, spared hosts,
> etc) ; at some time it will be reported back that there is no host
> available, which appears as a bad experience for user. 
> 
>  
> 
>  
> 
> De : Ian Wells [mailto:ijw.ubuntu at cack.org.uk] 
> Envoyé : mardi 8 avril 2014 01:02
> À : OpenStack Development Mailing List (not for usage questions)
> Objet : Re: [openstack-dev] [Nova] Hosts within two Availability
> Zones : possible or not ?
> 
> 
>  
> 
> On 3 April 2014 08:21, Khanh-Toan Tran <khanh-toan.tran at cloudwatt.com>
> wrote:
> 
>         Otherwise we cannot provide redundancy to client except using
>         Region which
>         is dedicated infrastructure and networked separated and
>         anti-affinity
>         filter which IMO is not pragmatic as it has tendency of
>         abusive usage.
>         
>         
>  
> 
> 
> I'm sorry, could you explain what you mean here by 'abusive usage'?
> 
> 
> 
> -- 
> 
> 
> Ian.
> 
> 
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