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Donald K. Burleson

Oracle RAC Tips

Infiniband Interconnect

Infiniband is an emerging standard that will help businesses build an ideal cluster database platform. This standard specifies channels that are created by attaching Host Channel Adapters (HCA) between servers for inter-process communication. Some of the significant features of Infiniband include:

  • Infiniband allows HCA to transfer data directly into or out of the applications buffer.
  • Data transfers are initiated directly from user mode, thus eliminating a costly context-switch to kernels. As a result, there is no system buffer involved.
  • Supports 2.5 Gbits/sec bandwidth. Because it allows bundling of multiple channels, effective bandwidth can grow appreciably.
  • Memory Windows provides a way for the application to grant remote read/write to a specified buffer with byte level granularity. RDMA write and read allows a clustered application such as Oracle RAC, to transfer data blocks directly from the cache in one instance to the cache in another instance in the cluster.
  • Reliability built into the hardware eliminates the need for implementing additional application checking and thus saves CPU cycles at the process level.

Selection of the proper interconnect is important for building a high performance Oracle Real Application Cluster. Care should be taken to select the highest speed technology that is suitable to one’s environment.

For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.  


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