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Is any discussion on this topic scheduled during the summit ?
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<div>Thanks,</div>
<div>Meghal</div>
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<div>On Apr 9, 2014, at 9:03 AM, Sylvain Bauza <<a href="mailto:sylvain.bauza@gmail.com">sylvain.bauza@gmail.com</a>> wrote:</div>
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<div class="gmail_quote">2014-04-07 23:11 GMT+02:00 Sylvain Bauza <span dir="ltr">
<<a href="mailto:sylvain.bauza@gmail.com" target="_blank">sylvain.bauza@gmail.com</a>></span>:<br>
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<div dir="ltr">Hi Phil,
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<div class="gmail_quote">2014-04-07 18:48 GMT+02:00 Day, Phil <span dir="ltr"><<a href="mailto:philip.day@hp.com" target="_blank">philip.day@hp.com</a>></span>:
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Hi Sylvain,<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">There was a similar thread on this recently – which might be worth reviewing: <a href="http://lists.openstack.org/pipermail/openstack-dev/2014-March/031006.html" target="_blank">http://lists.openstack.org/pipermail/openstack-dev/2014-March/031006.html</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Some interesting use cases were posted, and a I don’t think a conclusion was reached, which seems to suggest this might be a good case for a session in Atlanta.<u></u><u></u></span></p>
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<div>The funny fact is that I was already part of this discussion as owner of a bug related to it (see the original link I provided).</div>
<div>That's only when reviewing the code by itself that I found some discrepancies and raised the question here, before committing.</div>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Personally I’m not sure that selecting more than one AZ really makes a lot of sense – they are generally objects which are few in number and large in scale,
so if for example there are 3 AZs and you want to create two servers in different AZs, does it really help if you can do the sequence:<u></u><u></u></span></p>
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<p><u></u><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><span>-<span style="font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">
</span></span></span><u></u><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Create a server in any AZ<u></u><u></u></span></p>
<p><u></u><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><span>-<span style="font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">
</span></span></span><u></u><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Find the AZ the server is in<u></u><u></u></span></p>
<p><u></u><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><span>-<span style="font-style:normal;font-variant:normal;font-weight:normal;font-size:7pt;line-height:normal;font-family:'Times New Roman'">
</span></span></span><u></u><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Create a new server in any of the two remaining AZs<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Rather than just picking two from the list to start with ?<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">If you envisage a system with many AZs, and thereby allow users some pretty find grained choices about where to place their instances, then I think you’ll
end up with capacity management issues.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">If the use case is more to get some form of server isolation, then server-groups might be worth looking at, as these are dynamic and per user.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">I can see a case for allowing more than one set of mutually exclusive host aggregates – at the moment that’s a property implemented just for the set of aggregates
that are designated as AZs, and generalizing that concept so that there can be other sets (where host overlap is allowed between sets, but not within a set) might be useful.<u></u><u></u></span></p>
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<p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Phil<u></u><u></u></span></p>
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<div>That's a good point for discussing at the Summit. I don't have yet an opinion on this, I'm just trying to stabilize things now :-)</div>
<div>At the moment, I'm pretty close to submit a change which will fix two things :</div>
<div> - the decisional will be the same for both adding a server to an aggregate and update metadata from an existing aggregate (there was duplicate code leading to a few differences)</div>
<div> - when checking existing AZs for one host, we will also get the aggregates to know if the default AZ is related to an existing aggregate with the same name or just something unrelated</div>
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<div>Folks interested in the initial issue can review <a href="https://review.openstack.org/#/c/85961/">
https://review.openstack.org/#/c/85961/</a> for a proposal to fix.</div>
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<div>-Sylvain </div>
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