Cache Cooperation for Clustered Disconnected Computers University of Electro-Communications, JAPAN YASUDA, Kinuko email@example.com Introduction n Disconnection Problem n Mobile users are often disconnected or weakly connected to the server Server n Intolerable latency n Lack of access to remote resources n Possible Solution Internet (Backbone) n Disconnected Operation Mobile User Disconnected Operation n Exploits client cache while disconnected disconnect cache Server Cache misses are critical and may force the users to stop the current job. miss cache cache Cache Cooperation n Exploits remote client cache disconnect cache Server Allow clients to retrieve missing files not only from the server, but also from miss cache other clients. cache Coda Disconnected Hoarding Logically (Available Servers = 0) Reconnected Physically Emulating Resolving Reconnected (Available Servers > 0) Server disconnect reconnect sync cache Cache Cooperation Disconnected Hoarding Logically (Available Servers = 0) Reconnected Emulating Physically Emulating Resolving (Cooperating) Reconnected (Available Servers > 0) Isolated Disconnected (Available Server (Available disconnect Clients = 0) Clients > 0) Emulating cache cache (Isolated) Client Basic Performance n Test Environment Server 3.5MB (A) Connected File Transfer 4 hops (S) (A) 10.31sec cache SàC1 (B) Disconnected (B) (Remote cache) 9.67sec C1àC2 cache cache (C) IEEE802.11b 3.7msec (C1) (C2) Wireless LAN C1àC1 (C) Local cache Trace Data Evaluation Result (1) n 60 min. Hoarding, 60 min. Disconnect n Works great for project-shared files, though discouraging result for system files. Evaluation Result (2) n 120 min. Hoarding, 60 min. Disconnect n Promising result for system files.
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