[galaxy-dev] Importing files into Libraries

Hi, If we upload data and then import the data into libraries, how is that data then accessed when running a tool in the cloud. For example if we have hundreds of template files that we need to analyse the data, and we have a tool that is instantiated on a number of nodes in the clous, is the data in the libraries copied to each node? Or is the data access via nfs, symbolic link or some other method? Thanks Neil