Testing the CDF Distributed Computing Framework

Fermilab. It is mainly used to access datasets which com-prise a large amount of files and analyze the data. Up to now the DCache system is used to access the files. (Moti-vation for a change to SAM) In autumn 2004 some of the important datasets will only be readable with the help of the data handling system SAM (Sequential Access to data via Metadata) [2]. It turns out that the mature systems CAF and SAM have not yet been used in combination. There-fore tests of the systems are necessary to test the interplay of the data handling with the farms, the behaviour of the CAF and the user friendliness of the whole system. A second goal of CDF is to distribute computing. In 2005 50 % of the computing shall be located outside of Fer-milab. For this purpose CDF will use the DCAF (Decen-tralized CDF Analysis Farms) in combination with SAM