Local runtime layer
Non-distributed mechanisms needed by network service applications
Feeds information to global layer or performs local operations on behalf of global layer
Example mechanisms
- Application-specific filtering/aggregation of device monitoring data
- Example: OLTP server vs. DSS server
- Data layout and naming
- Example: record-based interface for DB, file-based for web server
- Device scheduling
- Example: maximize TPS vs. maximize disk bandwidth utilization
- Caching
- Coherence essential vs. coherence unnecessary
- More efficient caching implementation possible in second case