The computing grid

Introduction

CC-IN2P3 is a Tier-1 site belonging to the computing grids EGI and WLCG; it provides in this context a set of computing resources for those user communities.

If you are registered with a “Virtual Orgnization” (VO) recognized by the computing grids for which CC-IN2P3 is a partner, then you can use all or part of those services.

In case you own a computing account at CC-IN2P3, you can also use the interactive servers as a “User Interface” (UI) woth the grid.

In case of question or problem, please contact our user support.

Access

To use the computing grid you must connect to a UI, belong to a VO and own a valid certificate.

If you own computing account at CC-IN2P3, you can connect to the grid from the interactive servers which provide the grid tools such as gLite, SRM...

Authentication and authorization

Access to grid resources requires the possession of a valid certificate from an organization recognized by the grid.

In France, it is the Ministry of Education and Research that provides the certificates grid to the staff of accredited units.

CC-IN2P3 grid services

CC-IN2P3 provides a set of services for the computing grid, which this section presents the most important components.

Computing Elements

Two flavors of Computing Element are deployed at CC-IN2P3:

Storage Elements

The storage systems dCache, XRootD and iRODS are part of the CC-IN2P3 service portfolio and are integrated into the WLCG and EGI computing grids.

Information system

Two instances of BDII are provided by CC-IN2P3: site-bdii and top-bdii.

Vobox

LHC ALICE, ATLAS, CMS and LHCb experiments have a Vobox service at CC-IN2P3 for their own needs.

Voms

CC-IN2P3 manages some VO and maintains a VOMS server for this purpose.

Middleware

An instance of DIRAC is also part of the grid services provided by CC-IN2P3 in France Grilles, for several VO. For more information on this service, please read these pages (French only): Utiliser le service DIRAC.