Ch13_ECOA2e - Chapter 13 Selected Storage Systems and...

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Selected Storage Systems and Interfaces Chapter 13
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2 Chapter 13 Objectives Appreciate the role of enterprise storage as a distinct architectural entity. Expand upon basic I/O concepts to include storage protocols. Understand the interplay between data communications and storage architectures. Become familiar with a variety of widely installed I/ O interfaces.
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3 13.1 Introduction This chapter is a brief introduction to several important mass storage systems. You.will encounter these ideas and architectures throughout your career. The demands and expectations placed on storage have been growing exponentially. Storage management presents an array of interesting problems, which are a subjects of ongoing research.
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4 13.1 Introduction Storage systems have become independent systems requiring good management tools and techniques . The challenges facing storage management include: Identifying and extracting meaningful information from multi-terabyte systems. Organizing disk and file structures for optimum performance. Protecting large storage pools from disk crashes
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5 13.2 SCSI SCSI, an acronym for Small Computer System Interface , is a set of protocols and disk I/O signaling specifications that became an ANSI standard in 1986. The key idea behind SCSI is that it pushes intelligence from the host to the interface circuits thus making the system nearly self managing The SCSI specification is now in its third generation, SCSI-3, which includes both serial and parallel interfaces.
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6 13.2 SCSI Classic SCSI-2 daisy chains the host and disk devices along a parallel cable. Depending on the implement- ation, the cable may contain as many as 68 pins.
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7 13.2 SCSI The SCSI-2 protocol uses phases, as shown in this state diagram.
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8 13.2 SCSI The SCSI-3 Architecture Model (SAM) is a layered architecture of specifications for numerous serial and parallel interfaces. Each layer interacts with a host-level command architecture called the SCSI-3 Common Access Method (CAM) that can interface with practically any type of storage device. The layers communicate with each other using protocol service requests, indications, responses, and confirmations. We show the SAM on the next slide.
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9 13.2 SCSI The SCSI-3 Architecture Model
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10 13.2 SCSI One of the interesting SAM serial protocols is the IEEE 1394 interface, which is also known as FireWire. IEEE 1394 isn’t just a storage interface, it is a
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This note was uploaded on 06/13/2011 for the course CGS 3269 taught by Professor Staff during the Spring '08 term at University of Central Florida.

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Ch13_ECOA2e - Chapter 13 Selected Storage Systems and...

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