Hierarchical Storage Management at the NASA Center for Computational Sciences: From UniTree to SAM-QFS
Ellen M. Salmon, Adina Tarshish, Nancy Palm, S. K. Patel, Marty Saletta, Ed Vanderlan, Mike Rouch, Lisa Burns, Daniel Duffy, Robert Caine · 2004
This paper presents the data management issues associated with a large center like the NCCS and how these issues are addressed. More specifically, the focus of this paper is on the recent transition from a legacy UniTree (Legato) system to a SAM-QFS (Sun) system. Therefore, this paper will describe the motivations, from both a hardware and software perspective, for migrating from one system to another. Coupled with the migration from UniTree into SAM-QFS, the complete mass storage environment was upgraded to provide high availability, redundancy, and enhanced performance. This paper will describe the resulting solution and lessons learned throughout the migration process.