Dear OCCIers, I know that many of you are highly interested in the application on Cloud to enhance HPC and Grid computing infrastructures. We have created a google group "HPCcloud: High Performance and Grid Computing in the Cloud" (http://groups.google.com/group/HPCcloud). The purpose of this group is not to define standards but to present experiences and scenarios by individuals, organizations and projects to illustrate how Cloud computing can enhance the different types of distributed and high performance computing infrastructures in science and engineering. I hope that as result of the discussion we will contribute new use cases to OCCI-WG. The group covers the following aspects about innovative potential, benefits and challenges of new Cloud technologies and services in High Performance Computing (HPC) and Grid Computing research and business: - Cultural, security, political and legal barriers to implementing Cloud provisioning models in HPC and Grid environments - Architectures for integration of Cloud technologies and services with HPC and Grid infrastructures - Standardization of interactions between HPC and Grid platforms and Cloud infrastructures - Limitations of existing Cloud services and technologies for the capability and capacity computing demands of the HPC and Grid communities in the execution of both tightly-coupled HPC and loosely- coupled HTC applications - HPC Clouds offering platforms with HPC devices and configurations, and Scientific Clouds offering specific services for the scientific and technical computing community - Impact of virtualization on the performance of memory, CPU and I/O intensive, and latency sensitive applications, and virtualization support for specialized communication transports - Service and infrastructure scalability and elasticity management for the efficient execution of virtualized HPC and Grid platforms - Challenges of porting HPC applications to the Cloud and new computing paradigms for HPC on Cloud Ignacio -- Ignacio M. Llorente, Full Professor (Catedratico): http://dsa-research.org/doku.php?id=people:llorente DSA Research Group: web http://dsa-research.org and blog http://blog.dsa-research.org Globus GridWay Metascheduler: http://www.GridWay.org OpenNebula Virtual Infrastructure Engine: http://www.OpenNebula.org