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<div class="moz-cite-prefix">There is a good talk happening today at
2pm @ room B.206 in a Breakout session :<br>
<br>
"Divide and conquer: Resource Segregation in OpenStack"<br>
<br>
(I'm sorry, I can't provide the sched.org link, site seems to be
down)<br>
<br>
-Sylvain<br>
<br>
Le 13/05/2014 11:12, Meghal Gosalia a écrit :<br>
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Is any discussion on this topic scheduled during the summit ?
<div><br>
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<div>Thanks,</div>
<div>Meghal</div>
<div><br>
<div>
<div>On Apr 9, 2014, at 9:03 AM, Sylvain Bauza <<a
moz-do-not-send="true"
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 moz-do-not-send="true"
href="mailto:sylvain.bauza@gmail.com"
target="_blank">sylvain.bauza@gmail.com</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0px 0px
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<div dir="ltr">Hi Phil,
<div><br>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">2014-04-07 18:48
GMT+02:00 Day, Phil <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:philip.day@hp.com"
target="_blank">philip.day@hp.com</a>></span>:
<div class=""><br>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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lang="EN-US">
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<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Hi
Sylvain,</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span></p>
<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
moz-do-not-send="true"
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></span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </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.</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"></span></p>
</div>
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<div><br>
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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>
<div class="">
<div><br>
</div>
<div> <br>
</div>
<blockquote class="gmail_quote"
style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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lang="EN-US">
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </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:</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span></p>
<p><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><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Create
a server in any AZ</span></p>
<p><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><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Find
the AZ the server is in</span></p>
<p><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><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</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span></p>
<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 ?</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span></p>
<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.</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </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.</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </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.</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Phil</span></p>
<p class="MsoNormal"><span
style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </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>
<div><br>
</div>
</div>
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<div><br>
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<div>Folks interested in the initial issue can review
<a moz-do-not-send="true"
href="https://review.openstack.org/#/c/85961/">
https://review.openstack.org/#/c/85961/</a> for a
proposal to fix.</div>
<div><br>
</div>
<div>-Sylvain </div>
</div>
</div>
</div>
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