  In this paper we describe the design, and implementation of the Open Science
Data Cloud, or OSDC. The goal of the OSDC is to provide petabyte-scale data
cloud infrastructure and related services for scientists working with large
quantities of data. Currently, the OSDC consists of more than 2000 cores and 2
PB of storage distributed across four data centers connected by 10G networks.
We discuss some of the lessons learned during the past three years of operation
and describe the software stacks used in the OSDC. We also describe some of the
research projects in biology, the earth sciences, and social sciences enabled
by the OSDC.
