Cluster vS Grid


There are many differences between Grid and Clusters. The following table shows comparison of Grid and Clusters.

Population Commodity Computers Commodity and High-end computers
Ownership Single Multiple
Discovery Membership Services Centralized Index  and Decentralized Info
User Management Centralized Decentralized
Resource management Centralized Distributed
Allocation/ Scheduling Centralized Decentralized
Inter-Operability VIA and Proprietary No standards being developed
Single System Image Yes No
Scalability 100s 1000?
Capacity Guaranteed Varies, but high
Throughput Medium High
Speed(Lat. Bandwidth) Low, high High, Low

A cluster is a group of computers organized together to perform the same set of functions. For instance, you may have a cluster running your database software. Or you can have a cluster running your corporate e-mail server software.

A grid is a collection of resources. A grid can be composed of multiple clusters. In Oracle’s grid world, you can have a cluster of servers running the database software and a cluster of servers running the Application Server software. Since they are all in the grid, you can move resources from one cluster to another should demands dictate.


Oracle RAC Cluster Tips by Burleson Consulting

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