IBM 86655RY Hardware Maintenance Manual - Page 202
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Reference information This section contains information to help you understand the principles and uses of high-performance, redundant array of independent disk (RAID) controllers. This section describes the different ways that drives can be grouped together to create data-storage environments that require superior performance, flexibility, and reliable data storage. A listing of important acronyms, terms, and definitions is also included at the end of this section. Understanding RAID technology RAID is the technology of grouping several physical drives in a computer into an array that you can define as one or more logical drives. Each logical drive appears to the operating system as a single drive. This grouping technique greatly enhances logical-drive capacity and performance beyond the physical limitations of a single physical drive. When you group multiple physical drives into a logical drive, the ServeRAID controller can transfer data in parallel from the multiple drives in the array. This parallel transfer yields data-transfer rates that are many times higher than with nonarrayed drives. This increased speed makes the system better able to meet the throughput (the amount of data processed in a given amount of time) or productivity needs of the multiple-user network environment. The ability to respond to multiple data requests provides not only an increase in throughput, but also a decrease in response time. The combination of parallel transfers and simultaneous responses to multiple requests allows disk arrays to provide a high level of performance in network environments. 192 Hardware Maintenance Manual: Netfinity 7600 - Type 8665 Models 1RY, 2RY
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