In the last year a lot of work has been invested (by CERN IT and by ATLAS) to improve the entire software process of the ATLAS services with the goal to use the same procedures in place for baseline Grid services. This operational task needs to be finalised and a full integration of ATLAS and site procedures (primarly CERN) is still going on.

The counterpart of this activity on the user community is the distributed ATLAS support system, based on the integration of existing tools to deal with users and site issues This system (now in production in its first version for the last 12 month) has the potential to be beneficial for the entire HEP and other large user base communities.

## Future evolution:

More streamlined operations and procedures will allow ATLAS to sustain the operation of its system in the long run. Most of the experience is quite VO independent and will be shared within the project.

## Impact:

As demonstrated by the example of Dashboard, Ganga, User Analysis Support, ATLAS feeds back experience and development (coming from the experiment itself) into the Grid community (notably EGEE in the past 6 years). The DDM is actually a laboratory to understand multipetabyte data management (on a scale of 100+ sites and 1000+ users) which will be a major contribution to Grid technology and to the EGI in particular.

## Effort:

The total estimated effort to support these services worldwide is 3 FTEs, 50% co-funded through CERN, INFN and WLCG.

## CMS

CMS relies on a globally distributed computing model for its data processing and analysis, performed by more than 2000 scientists world-wide. The computing model is based on a hierarchy of tiered regional computing centres operating services for data management, transfers and workload management. The CMS Remote Analysis Builder (CRAB) tool allows the access to the distributed data, storage and processing resources in a transparent way. The PhEDEx Data Service provides access to information from the central PhEDEx database, as well as certificate- authenticated managerial operations such as requesting the transfer or deletion of data. The Data Service is integrated with the 'SiteDB' service for fine-grained access control, providing a safe and secure environment for operations. Below is a more detailed description of the services and the manpower required.

CRAB is a CMS specific user friendly interface to the WLCG resources and CMS Data Management tools. It supports access to OSG, WLCG and ARC resources. It uses the core CMS Workload Management code base and the WLCG provided API's to WMS, and provides a client- server solution to job submission. Users interact with a thin client which delegates work to a "centrally" operated server. The servers are well known to the CMS analysis community and run and are supported centrally and at remote centres. Long term maintenance of CRAB, for instance to handle updates to WMS API's and the CMS wrapper (BossLite) is necessary for both CRAB and the wider Workload Management system. Support, and significant training, of administrators of the servers is needed for the long term viability of the tool.

Impact: CRAB is the recommended and supported CMS analysis tool. It takes care of all transfer, catalogue and job submission operations. Migration, and associated testing, to more recent externals needs

7