09f_cpe431_chap6_9 - UAH CPE 431/531 Chapter 6 Storage and...

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1 1 Electrical and Computer Engineering CPE 431/531 Chapter 6 – Storage and Other I/O Topics Dr. Rhonda Kay Gaede UAH Electrical and Computer Engineering Page 2 of 30 UAH CPE 431/531 Chapter 6 (4 th Ed.) 6.1 Introduction Designers of I/O systems must consider issues such as ________________ and _______________________ as much as they consider performance. The performance of I/O is complex and dependent on many aspects of the system. Ignoring I/O is dangerous. Electrical and Computer Engineering Page 3 of 30 UAH CPE 431/531 Chapter 6 (4 th Ed.) 6.1 Introduction – Characteristics of I/O Devices Three Characteristics Behavior - ________________________ Partner - ________________________ Data rate - ________________________ Performance Metrics ________________________ __________________________ Desktop, server and embedded systems are sensitive to I/O ________________ and ____. Desktop and embedded systems are more focused on __________________ and ___________________, while server systems are more focused on _______________ and _______________________. Electrical and Computer Engineering Page 4 of 30 UAH CPE 431/531 Chapter 6 (4 th Ed.) 6.2 Dependability, Reliability, and Availability - Terminology Two states of service 1. Service accomplishment - 2. Service interruption – Transitions from 1 to 2 are ___________, transitions from 2 to 1 are _____________. Failures can be ___________ or ______________. Reliability is a measure of the continuous service accomplishment, the metric is _____________________. Availability is a measure of the service accomplishment with respect to the alternation between the two states of accomplishment and interruption. Electrical and Computer Engineering Page 5 of 30 UAH CPE 431/531 Chapter 6 (4 th Ed.) 6.2 Dependability, Reliability, and Availability – Considerations To increase _____, you can improve the _______ of components or design systems to _______ operation in the presence of components that have ______. Three techniques Fault avoidance Fault tolerance Fault forecasting We also need to work on decreasing _____ Electrical and Computer Engineering Page 6 of 30 UAH CPE 431/531 Chapter 6 (4 th Ed.) 6.3 Disk Storage - Preliminaries Magnetic disks are nonvolatile and rely on a col ection of rotating platters, each of which has two recordable disk surfaces and use moveable read/write heads for access. The stack of platters is rotated at 5400 to 15,000 RPM and has a diameter from an inch to just over 3.5 inches. Each disk surface is divided into concentric circles, cal ed ________, typical y _________________ per surface. Each track is in turn, divided into __________ that contain the
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09f_cpe431_chap6_9 - UAH CPE 431/531 Chapter 6 Storage and...

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