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Le 11/02/2014 16:09, Chris Friesen a écrit :
>
> Yes.  So what I'm suggesting is that we schedule the two VMs as one 
> call to the SolverScheduler.  The scheduler then gets reservations for 
> the necessary resources and returns them to the caller.  This would be 
> sort of like the existing Claim object in nova/compute/claims.py but 
> generalized somewhat to other resources as well.
>
> The caller could then boot each instance separately (passing the 
> appropriate reservation/claim along with the boot request). Because 
> the caller has a reservation the core code would know it doesn't need 
> to schedule or allocate resources, that's already been done.
>
> The advantage of this is that the scheduling and resource allocation 
> is done separately from the instantiation.  The instantiation API 
> could remain basically as-is except for supporting an optional 
> reservation token.

I think you really need to look at what Climate is, but I don't want to 
be boring...

Climate can provide you some way for doing the reservation, and possibly 
you would only need to write a plugin for such a request.

-Sylvain