The grid has emerged as a platform that enables to put in place an inter-organizational shared space known as Virtual Organization. The Virtual Organization (VO) encompasses users and resources supplied by the different partners for achieving the VO’s creation goal. Though many works offer solutions to manage a VO, the dynamic, on the fly creation of virtual organizations is still a challenge. ...

GriPhyN (Grid Physics Network) is a large US collaboration to build grid services for large physics experiments, one of which is LIGO, a gravitational-wave observatory. This paper explains the physics and computing challenges of LIGO, and the tools that GriPhyN will build to address them. A key component needed to implement the data pipeline is a virtual data service; a system to dynamically cr...

The access to Grid resources depends on policies defined by the administrators of the physical organizations and of the Grid middleware. This approach does not require support for access control in the middleware, but since changes in the access control policy of the Virtual Organization imply the involvement of one or more administrators, it lacks the flexibility needed in several Grid applica...

For a computer science course of distributed computing, Internet is, at the same time, an object for study, and a (virtual) library of resources (textbooks, tutorials, FAQs, software packages (especially FOSS), project examples. But especially, a place for experiments with grid, cluster, and distributed computing tasks, i.e. a virtual laboratory for High Performance Computing. In the paper, som...

The emergence of Grids enables the sharing of a wide range of resources for solving large-scale computational and data intensive problems in science, engineering and business. While much has been done to build Grid middleware on top of existing operating systems, little has been done to extend the underlying operating systems for enabling and facilitating Grid computing, for example by embeddin...

XtreemOS aims to build and promote a Linux based operating system to provide native Virtual Organization (VO) support in the next generation Grids. XtreemOS takes a different approach from many existing Grid middleware by: first, recognizing the fundamental role of VO in Grid computing and hence taking VO support into account from the very beginning of our design; and, second, getting around th...

The MetaCenter is both Czech national Grid and supercomputing infrastructure and a research project focused on sustainable advancement of this infrastructure. We describe a research activity bringing virtual network service to MetaCenter. It covers the reasons for implementing VirtCloud, system for managing virtual networks, expected use-cases, design and implementation constraints and interact...

GriPhyN has taken for its mission the development of general tools for managing and analyzing virtual data in petabyte-scale grid environments (Petascale Virtual-Data Grids or PVDGs) and providing a “Virtual Data Toolkit” (VDT) that we hope will be used by other data intensive scientific disciplines. This is a tall order. There are several distinct tasks related to virtual data that must be und...

The ATLAS Virtual Organization is grid’s largest Virtual Organization which is currently in full production stage. Hereby a case is being made that a user working within that VO is going to face a wide spectrum of different systems, whose heterogeneity is enough to count as “orders of magnitude” according to a number of metrics; including integer/float operations, memory throughput (STREAM) and...

Automated resource exchange and negotiation between participants of a Virtual Organization, or Peers of a Peer-to-Peer Grid, is an important feature of Grid computing because it enables scalable cooperation between entities under separate administrative control. Automated negotiation and accounting of resource consumption have been studied, and market-based resource exchange methods have been p...