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Hello Blair<br>
<br>
IMO it's a matter of capacity planning and design to minimize
fragmentation. I don't know of any mechanisms to filter this and
solve (i.e. re-balance) a posteriori. Blueprints exists, though, to
allow re-scheduling and re-balancing.<br>
<br>
Maybe I'm wrong and there are indeed some scheduler filters out of
the box...<br>
<br>
Anyways, I recommend you to read this:
<a class="moz-txt-link-freetext" href="http://rhsummit.files.wordpress.com/2014/04/deterministic-capacity-planning-for-openstack-final.pdf">http://rhsummit.files.wordpress.com/2014/04/deterministic-capacity-planning-for-openstack-final.pdf</a><br>
and open this spreadsheet:
<a class="moz-txt-link-freetext" href="https://github.com/noslzzp/cloud-resource-calculator">https://github.com/noslzzp/cloud-resource-calculator</a> , it will show
you the optimal flavor configuration for minimal fragmetation using
different variables (vcpu, RAM, disk)<br>
<br>
Regards<br>
<br>
<div class="moz-cite-prefix">On 2014-09-24 11:08 AM, Blair Bethwaite
wrote:<br>
</div>
<blockquote
cite="mid:CA+z5DsyxJLeAfqLY3tKEfb-97G2d8UCL+fXaKtsbQ_xsSN9d6w@mail.gmail.com"
type="cite">
<div dir="ltr">Hi all,
<div><br>
</div>
<div>I'm trying to wrap my head around whether it's possible
with the existing scheduler filters, to put a limit per host
on the number of instances per instance-type/flavor? I don't
think this is possible with the existing filters or weights,
but it seems like a fairly common requirement.</div>
<div><br>
</div>
<div>The issue I'm thinking of using this for is that of
instance-to-host fragmentation in homogenous deployments,
where there is a tendency as the zone approaches capacity to
hit a utilisation ceiling - there are rarely any "gaps" large
enough for high vcpu count instances. I'm guessing that
limiting the number of smaller instances per host would help
to alleviate this.</div>
<div><br>
</div>
<div>Looks like knocking up such a filter wouldn't be too hard,
just want to check whether there is another way...?<br
clear="all">
<div><br>
</div>
-- <br>
Cheers,<br>
~Blairo
</div>
</div>
<br>
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