 ATLAS
Grid Projects 
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The GANGA/GRAPPA
project is working to produce an interface between the user, the Grid
Middleware and the experimental software framework. It is being developed
jointly with the LHCb
experiment, and as it is using component technologies will allow reuse
elsewhere. 
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The design must be based on components; one
option under consideration is a Python bus. It is also important that the tool
works in a non-Grid environment
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Data replication is currently supplied by MAGDA
which will evolve into a thin interface.It is based on MySQL servers.
AMI handles the mapping between Logical File Names and allows
queries. Virtual
Data services allow data to be derived rather than
replicated.
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Another important issue is user software installation.
The large number of sites, many serving diverse user groups, requires
automated and scalable Installation Tools.
Several approaches are considered, but the present activity in
creating coherent rpms from CMT
(which maintains the software and the runtime environment), which will
also expose the package dependencies in the form of cache files. These
are then used by PACMAN
which can either pull or push complete installations to remote sites. PACMAN
has been adopted by the GriPhyN
project.
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In the UK,
the ATLAS Grid developments are in the context of the PPARC GridPP
collaboration, which supports and helps coordinate all particle physics Grid
activities. An ongoing joint project ATLAS/EDG ensures that the DataGrid
middleware supports our Data Challenges.
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