[Openstack-operators] Questions about waitlisting/queuing provisioning requests due to capacity

Digital Wonk digitalwonk at gmail.com
Mon Sep 15 17:13:01 UTC 2014

Hi All,

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

   - 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?
   - 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.
   - Are there any commercial products that provide this wait list or
   queuing functionality?

I came across Blazar, and it (and the notion of reservations) are somewhat
related to waitlists but not precisely:


One particular statement for delayed or scheduled reservations that
suggests a mismatch for wait lists or queues is:

"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)"

What if the cloud is always full?

Thanks in advance for the responses.

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