Capacity Leasing in Cloud Systems using the OpenNebula Engine

Borja Sotomayor, Rubeen Santiago Montero, Ignacio Martero Llorente, and Ian Foster
http://www.cca08.org/papers/Paper20-Sotomayor.pdf

The problem: is advanced leasing.

• In the current models resources are allocated at the time of request.
• resource requests subject to notrivial policies are not supported
• capacity specification in advance is not supported
• no support for variable resource usage
• dynamic renegotiation of resource allocation is not possible
• small cloud systems can benefit from queuing, priorities and advanced reservation

Approach: OpenNebula + Haiza

OpenNebula:

1. Core: Manages the lifecycle of a VM + management and monitoring of the physical host
   
2. Capacity Manager: Adjusts placement of VMs
   
3. pluggable Virtualizer Access Driver: expose the basic functionality of the hypervisor

Hiza is a lease manager:

1. leases in Haiza, hardware resource, software environment, and availability
2. Supports
3. advance reservation lease: request for resource at a specific time
   
4. best effort leases: resources are assigned as soon as possible, queuing resources if necessary
   
5. immediate leases: provisioned when requested or not at all