Alternative Architectures Contd...

Object Server (OS)
Similar to the Page Server Call Back Algorithm, but works only on Objects. Hence it experiences much overhead.
Hybrids : Modify Page Server
Add one or both of :

• Fine granularity (locking / replicas)
  • Transfer granularity = Page.
  • Concurrency control and / or replica management at object level. Hence avoids false sharing.
• Adaptive Granularity : Dyanamically determine the above granularities.