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Lecture 7 - CNIT 17600 IT Architectures I/O and Storage...

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10/13/2011 1 CNIT 17600 IT Architectures I/O and Storage Systems Lecture 7 Objectives Understand how I/O systems work, including I/O methods and architectures Become familiar with storage media, and the differences in their respective formats Understand how RAID improves disk performance and reliability, and which RAID systems are most useful today Appreciate the role of enterprise storage as a distinct architectural entity Understand the interplay between data communications and storage architectures Become familiar with a variety of widely installed I/O interfaces 2
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10/13/2011 2 7.1 Introduction Data storage and retrieval is one of the primary functions of computer systems One could easily make the argument that computers are more useful to us as data storage and retrieval devices than they are as computational machines All computers have I/O devices connected to them to achieve high performance, I/O should be kept to a minimum In studying I/O, we seek to understand the different types of I/O devices as well as how they work 3 7.2 I/O and Performance Sluggish I/O throughput can have a ripple effect, dragging down overall system performance This is especially true when virtual memory is involved The fastest processor in the world is of little use if it spends most of its time waiting for data If we really understand what’s happening in a computer system we can make the “best possible” use of its resources 4
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