<div dir="ltr">Hi Tim,<div><br></div><div>Thank you for the information! We'll try it out.</div><div><br></div><div>Edwin</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Sep 15, 2014 at 10:25 AM, Tim Bell <span dir="ltr"><<a href="mailto:Tim.Bell@cern.ch" target="_blank">Tim.Bell@cern.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">There were some studies done by INFN into how this could work. See
<a href="http://indico.cern.ch/event/272791/session/0/contribution/6/material/slides/1.pdf" target="_blank">
http://indico.cern.ch/event/272791/session/0/contribution/6/material/slides/1.pdf</a> for a description. Two approaches, with a modified scheduler or potentially a blazar lease type.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">This is a particular challenge in the research and HPC private clouds where high levels of utilisation are very typical.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Tim<u></u><u></u></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif""> Digital Wonk [mailto:<a href="mailto:digitalwonk@gmail.com" target="_blank">digitalwonk@gmail.com</a>]
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<b>Sent:</b> 15 September 2014 19:13<br>
<b>To:</b> <a href="mailto:openstack-operators@lists.openstack.org" target="_blank">openstack-operators@lists.openstack.org</a><br>
<b>Subject:</b> [Openstack-operators] Questions about waitlisting/queuing provisioning requests due to capacity<u></u><u></u></span></p>
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<p class="MsoNormal">Hi All,<u></u><u></u></p>
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<p class="MsoNormal">Hopefully, this is the appropriate group to post these questions. My organization operates a public cloud which is always at capacity due to the demand, and we're looking at OpenStack approaches to handle the capacity issue.<u></u><u></u></p>
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What successful strategies have other groups used to deal with highly utilized clouds? Obviously, increasing a monetary price for resources is one approach, but barring that, what are other methods?<u></u><u></u></li><li class="MsoNormal">
Are there any existing schedulers, extensions, openstack projects, or any forthcoming blueprints that provide the ability to wait list or queue a request if resources are at capacity until resources are available to satisfy that request. I'm particularly interested
in nova.<u></u><u></u></li><li class="MsoNormal">
Are there any commercial products that provide this wait list or queuing functionality?<u></u><u></u></li></ul>
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<p class="MsoNormal">I came across Blazar, and it (and the notion of reservations) are somewhat related to waitlists but not precisely:<u></u><u></u></p>
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<p class="MsoNormal"><a href="https://wiki.openstack.org/wiki/Blazar" target="_blank">https://wiki.openstack.org/wiki/Blazar</a><u></u><u></u></p>
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<p class="MsoNormal">One particular statement for delayed or scheduled reservations that suggests a mismatch for wait lists or queues is:<u></u><u></u></p>
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<p class="MsoNormal">"In this reservation type lease is created successfully if Blazar thinks there will be enough resources to process provisioning later (otherwise this request returns failure status)"<u></u><u></u></p>
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<p class="MsoNormal">What if the cloud is always full?<u></u><u></u></p>
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<p class="MsoNormal">Thanks in advance for the responses.<u></u><u></u></p>
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<p class="MsoNormal">Edwin<u></u><u></u></p>
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