DEcorum File System Architectural Overview

Michael L. Kazar, Bruce W. Leverett, Owen T. Anderson, Vasilis Apostolides, Beth A. Bottos, Sailesh Chutani, Craig F. Everhart, W. Anthony Mason, Shu-Tsui Tu, Edward R. Zayas, "DEcorum File System Architectural Overview", Proceedings of the Summer 1990 USENIX Conference, Anaheim, CA, June 1990, 151-163, pdf
(ps.gz body + fig1 + fig2 + fig3, pdf body + fig1 + fig2 + fig3).