1. 1 Pangaea: A File Service for Planetary-Scale Distributed Applications Yasushi Saito, Christos Karamanolis, Magnus Karlsson, Mallik Mahalingam HP Laboratories

2. 2 Pangaea: A Wide-area File Service Goals: wide area performance & availability with local-area feel. 1000 nodes, 10 10 files. Support frequently written files. Decentralization. Applications: Wide-area collaboration, dist. application services. Approaches: Aggressive replication. Proactive update propagation. QoS-conscious data placement.

3. 3 Overview /Joe/movie.mpg /Joe/mail.txt /Joe Root –Many files, replicated on 1000 nodes. –Each replica has a limited view of the replica set –A connected graph maintained for each object

4. 4 Research Issues Cheap but reliable replica addition/removal Automatic graph shaping When and where to create and remove replicas? /Joe/movie.mpg /Joe/mail.txt /Joe Root Contact: ysaito@hpl.hp.com http://www.hpl.hp.com/research/itc/csl/ssp/