.

List of some issues with the local installation triggered by experiment activity. This refers to the issues mentioned in Section 3. This applies to the case LCG is requested by the experiments to develop a tool that allows for automatic software installation triggered by the experiments and supported at the farm level.

• Automatic mechanism needed to trigger distribution to the WNs
• Signal needed to tell the production manager that the nodes are ready
• Then the ESM has to run certification job and set the variable in the information system
• The experiment has to wait during the distribution before testing can tak place
• There can be only 1 or 2 version installed at the same time because the scratch space on the node is limited

A system with this kind of complexity, even if desirable from several points of view, would require substantial development and organization and cannot be foreseen as a time 0 solution.