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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">On a large cloud you’re protect against this to some extent if the number of servers is >> number of instances in the quota.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">However it does feel that there are a couple of things missing to really provide some better protection:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">A quota value on the maximum size of a server group<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">A policy setting so that the ability to use service-groups can be controlled on a per project basis<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Khanh-Toan Tran [mailto:khanh-toan.tran@cloudwatt.com]
<br>
<b>Sent:</b> 08 April 2014 11:32<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Nova] Hosts within two Availability Zones : possible or not ?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">“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.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">De :</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Ian Wells [<a href="mailto:ijw.ubuntu@cack.org.uk">mailto:ijw.ubuntu@cack.org.uk</a>]
<br>
<b>Envoyé :</b> mardi 8 avril 2014 01:02<br>
<b>À :</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Objet :</b> Re: [openstack-dev] [Nova] Hosts within two Availability Zones : possible or not ?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span lang="FR">On 3 April 2014 08:21, Khanh-Toan Tran <<a href="mailto:khanh-toan.tran@cloudwatt.com" target="_blank">khanh-toan.tran@cloudwatt.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="FR">Otherwise we cannot provide redundancy to client except using Region which<br>
is dedicated infrastructure and networked separated and anti-affinity<br>
filter which IMO is not pragmatic as it has tendency of abusive usage.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="FR"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="FR">I'm sorry, could you explain what you mean here by 'abusive usage'?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="FR">-- <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="FR">Ian.<o:p></o:p></span></p>
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