RAC Dynamic Reorganization

10g Grid Computing with RAC
Real Application Cluster Architecture

Dynamic Reorganization (DR) within a Server

DR is an operating environment feature that provides the ability to replace and reconfigure system hardware while the system is running. This feature is optional and can be implemented at the discretion of the system administrator. The main benefit of DR is that an administrator can add or replace hardware resources (such as CPUs, memory, and I/O interfaces) with little interruption of normal system operations. The DR process helps to increase the overall uptime and availability of servers.

For example, the DR method is available for Sun system architectures that contain multiple system boards, and use board slots that support hot plugging. The DR facility is very well implemented for Sun Fire servers series 3800-6800. By using the DR methodology, hardware components can be added or removed from a system with minimal interruption. The DR is performed at attachment points. DR allows connect or disconnect attachment points. The Sun Fire series supports the following attachment points for dynamic reorganization.

• IO Assembly (PCI / ePCI assemblies)
   

• CPU / Memory Boards
   

• CPCI cards
   

• System Memory
   

• CPU/s

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