Lauri Loebel-Carpenter, Lee Lueking, Carmenita Moore, Igor Terekhov, Julie Trumbo, Sinisa Veseli, Matthew Vranicar, Steven P. White, Victoria White

SAM is a network-distributed data management system developed at Fermilab for use with Run II data. It is being employed by the D0 Experiment to store, manage, deliver, and track processing of all data. We describe the design and features of the system including resource management and data transfer mechanisms. We show the operational experience D0 has accumulated to date including data acquisition, processing,  and all levels of access and delivery. We present various configurations of the system and describe their use in the collaboration.