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Аннотация:The CMS experiment at CERN is preparing for LHC data taking in several
computing preparation activities. In early 2007 a traffic load generator infrastructure for
distributed data transfer tests was designed and deployed to equip the WLCG tiers which
support the CMS virtual organization with a means for debugging, load-testing and
commissioning data transfer routes among CMS computing centres. The LoadTest is based
upon PhEDEx as a reliable, scalable data set replication system. The Debugging Data Transfers
(DDT) task force was created to coordinate the debugging of the data transfer links. The task
force aimed to commission most crucial transfer routes among CMS tiers by designing and
enforcing a clear procedure to debug problematic links. Such procedure aimed to move a link
from a debugging phase in a separate and independent environment to a production
environment when a set of agreed conditions are achieved for that link. The goal was to deliver
one by one working transfer routes to the CMS data operations team. The preparation,
activities and experience of the DDT task force within the CMS experiment are discussed.
Common technical problems and challenges encountered during the lifetime of the taskforce in
debugging data transfer links in CMS are explained and summarized.