Monthly Archives: December 2008

Virtualization is the Foundation for Cloud Infrastructures

In my opinion, one of the main new features offered by cloud systems is the provision of virtualized resources as a service, being virtualization the enabling technology. In other words, one of the relevant contributions of cloud computing is the Infrastructure as a Service (IaaS) model. I have prepared a post to describe some of the research challenges in cloud infrastructures that, in my opinion, will be addressed in the new year. The open research issues are mainly related to new virtualization technologies to enable efficient, dynamic and scalable Cloud operation and interoperation.

Happy new year!

1st International Workshop on Grids, Clouds and Virtualization

Held in conjunction with the 4th International Conference on Grid and Pervasive Computing, GPC 2009,  Geneva, 4-8 May 2009
Workshop website:

The Workshop on Grids, Clouds and Virtualization is an international forum which brings together researchers and practitioners working on different high-performance aspects of web/grid services, middleware and technologies including virtualization that enable grid-aware and cloud applications. The enabling technologies and middleware include tools to assemble together different resources such as parallel supercomputers, data archives, high-speed storage systems, advanced visualization devices and scientific instruments using high speed networks connecting geographically distributed devices and organizations. Many recent international efforts are actively fostering the development of  virtualization technologies and solutions. The Workshop will allow exchanging ideas and results related to on-going grid and cloud computing research, focusing on different aspects of middleware, technologies and applications.


Creating breakthrough middleware and virtualization technologies for high-performance grid and cloud applications requires addressing several key computing problems which may lead to novel solutions and new insights in interdisciplinary applications. The focus of the workshop is on all forms of advances in grid, clouds and virtualization middleware/applications, and related topics.  The workshop solicits novel papers on a broad range of topics, including but not limited to:

• Grid infrastructures: advances and evaluation of grid middleware
• Cloud infrastructures: advances and evaluation of virtualization technologies
• Virtualization technologies: tools, middleware, management of virtual environments, virtualization of  storage resources, security aspects
• Grid/cloud security: access policies, authentication, authorization, performance aspects of middleware
• P2P grid/cloud infrastructures: protocols, remote execution, security aspects
• Grid/cloud performances: benchmarking of enabling technologies
• Grid/cloud applications: best practices related to solving large-scale problems on grid/cloud infrastructures
• Data Grid/cloud: advances on management and analysis of large datasets
• Grid/cloud accounting, monitoring and scheduling
• Parallel applications on grid/cloud infrastructures: theory and practice, programming models, intercluster communications, remote execution
• Fault tolerant grid/cloud and virtualization technologies


The proceedings of the workshop will be published by IEEE. Authors are invited to submit 8-page papers in IEEE 2-column format by December 20, 2008. Papers must be submitted to the following email address:

The results presented in the paper must be unpublished and not submitted for publication elsewhere, including the proceedings of other conferences or workshops. Papers will be peer-reviewed by at least three reviewers. Papers are evaluated with respect to originality, significance, clarity, and technical soundness. One author of each accepted paper will be expected to present the paper at the workshop.


Paper submission: January 15, 2008
Author notification: January 30, 2009
Camera ready: February 15, 2009
Workshop: May 4-8, 2009


Giovanni Aloisio
University of Salento & CMCC, Italy

Massimo Cafaro
University of Salento & CMCC, Italy

Sandro Fiore
University of Salento & CMCC, Italy


GGagan Agrawal, Ohio State University, USA
Henry Casanova, University of Hawaii, USA
Ewa Deelman, ISI/USC, USA
Jack Dongarra, University of Tennessee, USA
Geoffrey Fox, Indiana University, USA
Peter kacsuk, MTA SZTAKI, Hungary
Thilo Kielmann, Vrije Universiteit, The Netherlands
Laurent Lefevre, INRIA, University of Lyon, France
Ignacio Llorente, Universidad Complutense de Madrid, Spain
Jarek Nabrzyski, LSU, USA
Omer Rana, Cardiff University, UK
Rick Stevens, ANL, University of Chicago, USA
Lizhe Wang, University of Karlsruhe, Germany

The OpenNebula Virtual Infrastructure Engine

As first post in this community blog, I would like to introduce one of the new projects within the Xen Community. We started OpenNebula a few years ago in order to provide an open-source alternative to commercial tools for the dynamic management of VMs on distributed resources.  OpenNebula provides an efficient, dynamic and scalable management of Xen VMs within datacenters, private clouds, involving a large amount of virtual and physical servers. Let me enumerate its main features and provide some links for more details:

OpenNebula is one of the components being enhanced in the context of RESERVOIR, European research initiative in virtualized infrastructures and cloud computing.

The OpenNebula Team

Oracle joins the Xen Advisory Board

The Xen community is pleased to announce the addition of Oracle to the Xen Advisory Board. Oracle joins seven other leading enterprise vendors to offer expertise and leadership to promote the Xen hypervisor as the industry standard in open source virtualization. Because Oracle is a recognized industry leader, the community will surely gain valuable insight into the requirements necessary for future development efforts to enable the Xen hypervisor to deliver
enterprise class features.

Throughout 2008, Oracle significantly increased its contribution to the community, including a focus on the new Xen debugger, a new implementation effort on the Xen API, timer testing, new memory caching algorithms, and updates to support Oracle software running on the Xen hypervisor. These contributions from Oracle are valuable to the Xen customer base as they provide enhancements to the Xen hypervisor’s capabilities in the enterprise and cloud computing space. These features are also important to the development community as the new Xen debugger delivers greater insight into the hypervisor’s state during development testing, allowing for faster bug identification and fixes.

As with all Xen contributions, Oracle’s input has been made available to the broader Xen community and open sourced. In addition, Oracle is hosting the Xen Summit North America event in February 2009 at their headquarters in Redwood Shores, CA. More than 175 participants are expected to attend the event designed to allow the community to collaborate and share best practices in Xen development. More information on this event is available here.

“Having Oracle join the Xen Advisory Board is a significant milestone for the community and Xen hypervisor,” said Ian Pratt, founder of the xen project and Chairman of “With Oracle’s industry leadership and enterprise market experience, the community is further strengthened, ensuring a continued leadership position as the open source hypervisor of choice.”

“As a leading contributor to the Open Source community, Oracle is pleased to join the Xen Advisory Board,” said Wim Coekaerts, vice president Linux Engineering, Oracle. “With development projects such as enhancing Oracle Cluster File System 2 with features useful for virtualization, memory management changes with the hcache and hswap projects and integrating the Linux data integrity project into Xen, Oracle continues to focus on enhancing Xen with enterprise-class features.”

The Xen Advisory Board provides oversight and guidance to the Xen project for all community activities, technology development, and management of the Xen® trademark. The Xen Advisory Board includes membership from the top eight contributors to the Xen project, as well as the key vendors delivering the Xen hypervisor. Current advisory board members are Citrix, HP, IBM, Intel, Novell, Oracle, Red Hat, and Sun Microsystems.

Xen Document Project Update

For those of you curious about the Xen Document project, you can see the latest at All documentation requests are posted on the site along with people who are working on the updates and status of those changes. Please contact me if you have any questions.

As an update on the Xen 3.3 User Guide, I have a new version posted with all the cosmetic changes complete. The next set of changes are requested on the Wiki page.