Motivation
Grid architecture emphasized in the past
- Security
- Compute resource coordination & scheduling
- Network resource coordination & scheduling (QOS)
SRMs role in the data grid architecture
- Shared storage resource allocation & scheduling
- Especially important for data intensive applications
- Often files are archived on a mass storage system (MSS)
- Wide area networks – minimize transfers
- large scientific collaborations (100’s of nodes, 1000’s of clients) – opportunities for file sharing
- Nodes may be organized by tier levels
- File replication and caching may be used
- Have to support non-blocking (asynchronous) requests