[openstack-dev] Next steps for Whole Host allocation / Pclouds

Mike Spreitzer mspreitz at us.ibm.com
Wed Jan 22 14:57:04 UTC 2014

> From: Sylvain Bauza <sylvain.bauza at bull.net>
> Le 22/01/2014 02:50, Jay Pipes a écrit :
> >
> > Yup, agreed. It's difficult to guess what the capacity implications
> > would be without having solid numbers on customer demands for this
> > functionality, including hard data on how long such instances would
> > typically live (see my previous point about re-using compute hosts for
> > other purposes once the last dedicated instance is terminated on that
> > host).
> >
> > Best,
> > -jay
> >
> >
> My personal opinion (but I can be wrong) is that such feature would only 

> be accepted by operators only if there is some termination period 
> defined when you create a dedicated instance.
> Again, what happens when the lease (or the lock-in) ends should be 
> defined by the operator, on his own convenience, and that's why Climate 
> is behaviour-driven by configuration flags for lease termination.

Is that enough?  Remember that some of us are concerned with business 
workloads, rather than HPC jobs.  While it might be acceptable in a 
business workload to plan on regularly recycling every individual 
instance, it is definitely not acceptable to plan on a specific end to a 
given workload.  And if the workload lives on, then usage of particular 
hosts can live on (at least for a pretty large amount of time like the 
product of (lifetime of a VM) * (number of VMs on the host) ).

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