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RAC Server and Disk TechnologyThe database system resides on a server, often called the host, and it accesses the storage volumes. The storage subsystem presents the storage volumes (or disks) to the server for use by the database. This chapter discusses the close connection the database engine has with the storage subsystem, the storage components, and the I/O path. The two main components, the storage unit and the server, are crucial for a well-designed and robust database system. Even though we can establish cluster technology to protect the server, the provision of redundancy within a server and at the storage level adds great value to the overall design of the database cluster. This chapter focuses on the following three major issues:
Storage redundancy demands that all storage components and I/O paths are well designed to avoid any unforeseen failures. Server redundancy requires that most of the components be equipped with reliable and redundant parts. The cluster file system is a new and reliable method of setting up the storage volumes into shareable file systems. The ease of use and flexibility of administration provided by the cluster file system has brought new interest to the RAC system. We will also discuss the concept, implementation, and various CFS products available for the RAC system. 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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