Problem Statement
Large number of objects reside in files on a distributed Data Grid
- 108 – 109 objects
- O.5 – 5 million files
- 15,000 – 150,000 tapes
Distributed system can be across continents
Some of the data is replicated based on demand or pre-assigned replication
Request expressed as logical request by user
Systems and network may fail
Problem: given a logical request, get relevant data to local system without human intervention