Author Archives: imllorente

About imllorente

Dr. Ignacio M. Llorente is a Full Professor in Computer Architecture and Technology at Universidad Complutense de Madrid, where he leads the Distributed Systems Architecture Group. He is co-leading research and development efforts, such as the OpenNebula VM Manager and the Globus GridWay Metascheduler, and involved in international research projects, such as EGEE-III, BEinGRID, RESERVOIR and Glbus Alliance.

OpenNebula + Xen = Innovative Cloud Solution

The OpenNebula team is proud to announce the availability of OpenNebula 1.4 (Hourglass), a new stable release of the OpenNebula Virtual Infrastructure Manager.
OpenNebula focuses on incorporating bleeding edge technologies and innovations in many areas of virtual infrastructure management and Cloud Computing. OpenNebula 1.4 aims to be the swiss-army knife of Cloud Computing, letting you deploy any type of Cloud.
The OpenNebula team is proud to announce the availability of OpenNebula 1.4 (Hourglass), a new stable release of the OpenNebula Cloud Toolkit. OpenNebula focuses on incorporating bleeding edge technologies and innovations in many areas of virtual infrastructure management and Cloud Computing. OpenNebula 1.4 aims to be the swiss-army knife of Cloud Computing, letting you deploy any type of Cloud:
  • EC2 Query API interface on top of OpenNebula, so you can turn your OpenNebula installation in a Public Cloud
  • Support of OGF’s Open Cloud Compute Interface specification
  • Multiple user support and access-right control for Virtual Machines and Virtual Networks
  • Advance contextualization support to integrate VM packs and implement multi-component services
  • A new OpenNebula Cloud API (OCA) to easily develop any cloud interface or cloud application
  • Easy integration with your data-center services and procedures with a new hook system
  • Many bug fixes, and scalability and performance improvements in several components of the OpenNebula system
  • A whole new set of documentation pages, guides and examples
  • Support for LVM storage

Enjoy the technology!

OpenNebula 1.2 Released

We have just announced the availability of OpenNebula 1.2, the second stable release of the project. This is an important milestone for the project and marks that most of the components of OpenNebula are now in place. OpenNebula 1.2 builds on the state-of-the-art technology for the distributed management of virtual infrastructures introduced with OpenNebula 1.0, bringing important improvements in the following areas: Network Management, Image Management, Scalability and Robustness, Configuration, Installation, and Documentation

More information:

3rd International Workshop on Virtualization Technologies in Distributed Computing (VTDC-09)

Call for Papers
3rd International Workshop on Virtualization Technologies in
Distributed Computing (VTDC-09)

In conjunction with ICAC 2009
Barcelona, Spain, June 15 2009

Workshop scope:

Virtualization has proven to be a powerful enabler in the field of
distributed computing and has led to the emergence of the cloud
computing paradigm and the provisioning of Infrastructure-as-a-Service
(IaaS). This new paradigm raises challenges ranging from performance
evaluation of IaaS platforms, through new methods of resource management
including providing Service Level Agreements (SLAs) and energy- and
cost-efficient schedules, to the emergence of supporting technologies
such as virtual appliance management.

For the last three years, the VTDC workshop has served as a forum for
the exchange of ideas and experiences studying the challenges and
opportunities created by IaaS/cloud computing and virtualization
technologies. VTDC brings together researchers in academia and industry
who are involved in research, development and planning activities
involving the use of virtualization in the context of distributed
systems, where the opportunities and challenges with respect to the
management of such virtualized systems is of interest to the ICAC
community at large.

Important dates:

* Submission deadline: February 20th, 2009
* Notification of acceptance: March 23rd, 2009
* Final manuscripts due: April 6, 2009
* Workshop: June 15, 2009


Authors are invited to submit original and unpublished work that
exposes a new problem, advocates a specific solution, or reports on
actual experience. Papers should be submitted as full-length 8 page
papers of double column text using single space 10pt size type on an
8.5×11 paper. Papers will be published in the proceedings of the
workshop. VTDC 2009 topics of interest include, but are not limited to:

* Infrastructure as a service (IaaS)
* Virtualization in data centers
* Virtualization for resource management and QoS assurance
* Security aspects of using virtualization in a distributed environment
* Virtual networks
* Virtual data, storage as a service
* Fault tolerance in virtualized environments
* Virtualization in P2P systems
* Virtualization-based adaptive/autonomic systems
* The creation and management of environments/appliances
* Virtualization technologies
* Performance modeling (applications and systems)
* Virtualization techniques for energy/thermal management
* Case studies of applications on IaaS platforms
* Deployment studies of virtualization technologies
* Tools relevant to virtualization


* General Chair:
o Kate Keahey, University of Chicago, Argonne National Laboratory

* Program Chair:
o Renato Figueiredo, University of Florida

* Steering Committee Chair:
o Jose A. B. Fortes, University of Florida

* Program Committee:
o Franck Cappello, INRIA
o Jeff Chase, Duke University
o Peter Dinda, Northwestern University
o Ian Foster, University of Chicago, Argonne National Laboratory
o Sebastien Goasguen, Clemson University
o Sverre Jarp, CERN
o John Lange, Northwestern University
o Matei Ripeanu, University of British Columbia
o Paul Ruth, University of Mississippi
o Kyung Ryu, IBM
o Chris Samuel, Victorian Partnership for Advanced Computing
o Frank Siebenlist, Argonne National Laboratory
o Dilma da Silva, IBM
o Mike Wray, HP
o Dongyan Xu, Purdue University
o Mazin Yousif, Avirtec
o Ming Zhao, Florida International University

* Publicity Chair:
o Ming Zhao, Florida International University

For more information:
VTDC-09 Web site:
ICAC-09 Web site:

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