3.1 – Cables and Adapters: SCSI Device Cables
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Questions and Answers

What is the primary purpose of SCSI?

  • To convert serial connections to parallel
  • To uniquely identify each device in a network
  • To connect various devices such as storage and printers to a single interface (correct)
  • To enhance the processing speed of computers

How many devices can a single SCSI chain typically support?

  • 8 devices on a narrow bus or 16 on a wide bus (correct)
  • 5 devices on a narrow bus or 12 on a wide bus
  • 4 devices on both narrow and wide bus configurations
  • 10 devices on any configuration

Which of the following does SCSI support?

  • Only serial connectivity
  • Wireless connectivity only
  • Both parallel and serial connectivity (correct)
  • Only parallel connectivity

What distinguishes iSCSI from traditional SCSI?

<p>iSCSI is a standard for connecting over IP networks (C)</p> Signup and view all the answers

What type of interface is found on the somewhat dated motherboard mentioned?

<p>An Ultra 3 SCSI connector (A)</p> Signup and view all the answers

What advantage does SCSI have in terms of device accessibility?

<p>It automatically identifies devices in the chain (B)</p> Signup and view all the answers

Before USB and SATA became common, which technology was primarily used for connecting peripherals?

<p>SCSI (A)</p> Signup and view all the answers

Which statement about SCSI's current usage is true?

<p>SCSI is still found in many legacy systems and virtual environments (A)</p> Signup and view all the answers

What is the purpose of a SCSI ID number in a SCSI configuration?

<p>To differentiate between multiple devices on the same cable (B)</p> Signup and view all the answers

What is the function of a SCSI terminator in a SCSI setup?

<p>To enable multiple devices to communicate on the same cable (A)</p> Signup and view all the answers

How does Serial Attached SCSI (SAS) simplify the connection process compared to older SCSI configurations?

<p>It eliminates the need for SCSI IDs and terminators (D)</p> Signup and view all the answers

In a SCSI configuration, which component is utilized to connect multiple devices to a single interface?

<p>SCSI ribbon cable (C)</p> Signup and view all the answers

What does LUN stand for and what is its function in a SCSI setup?

<p>Logical Unit Number; it identifies individual drives within a chassis (B)</p> Signup and view all the answers

What identifies the chassis in a drive array for SCSI devices?

<p>SCSI ID (C)</p> Signup and view all the answers

What key feature differentiates SAS from previous SCSI configurations?

<p>Serial communication for increased throughput (A)</p> Signup and view all the answers

Which component is NOT typically found on the back of an external SCSI storage device?

<p>USB port (B)</p> Signup and view all the answers

What type of devices did SCSI ID numbers need to differentiate in older configurations?

<p>All devices connected to the same cable (A)</p> Signup and view all the answers

During the connection of SCSI devices, which device is normally assigned the SCSI ID of 0?

<p>The SCSI controller (C)</p> Signup and view all the answers

Which statement best describes the evolution of SCSI technology?

<p>SCSI has transitioned from parallel communication to serial communication with SAS. (B)</p> Signup and view all the answers

What does a SCSI controller do in a SCSI setup?

<p>Serves as the main interface for device communication (A)</p> Signup and view all the answers

What potential issue does assigning SCSI IDs help to prevent?

<p>Conflict between multiple devices on the same cable (B)</p> Signup and view all the answers

Which statement accurately describes a key characteristic of older SCSI configurations?

<p>They require manual jumper settings for device IDs. (B)</p> Signup and view all the answers

Which of the following is a major advantage of serial attached SCSI (SAS) over traditional SCSI?

<p>Simplified connection with no need for jumper settings (B)</p> Signup and view all the answers

Flashcards

SCSI (Small Computer Systems Interface)

A standardized interface for connecting storage devices, scanners, printers, and other peripherals to a computer. It allows for daisy-chaining multiple devices on a single connection.

Parallel SCSI

A type of SCSI connection that uses parallel data transfer, enabling faster data transmission.

Serial SCSI

A type of SCSI connection that transfers data bit by bit, simplifying cable design and reducing signal interference.

iSCSI (SCSI over IP)

A SCSI standard allowing communication over an IP network, expanding its reach and eliminating the need for physical connections.

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PATA (Parallel ATA)

A legacy interface used for connecting hard drives and other devices to a computer, employing parallel data transfer.

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SATA (Serial ATA)

A more efficient interface for connecting storage devices, using serial data transfer for faster speeds and reduced cabling.

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Intelligent Connectivity in SCSI

The capability of SCSI to automatically identify and configure connected devices, easing setup and management.

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Daisy-chaining in SCSI

A feature of SCSI that allows multiple devices to be connected in a chain on a single connector, increasing versatility and efficiency.

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SCSI

A standardized method of connecting multiple devices to a single interface, often used for hard drives and other storage devices.

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SCSI ID

A unique identifier assigned to each device connected to a SCSI bus.

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SCSI Terminator

A special device at the end of a SCSI cable that prevents signal reflections, allowing multiple devices to communicate smoothly.

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Logical Unit Number (LUN)

A method used to address individual drives within a SCSI drive array (chassis).

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Serial Attached SCSI (SAS)

A more recent, serial-based version of SCSI that simplifies setup and provides higher speeds.

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High Density Internal SAS Connector

A connector type for SAS drives often used inside computers, characterized by its high density and many pins.

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Parallel to Serial Communication Transition

A technology that moved from parallel communication to serial communication, simplifying setup and increasing data transfer speeds.

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Daisy Chaining

The practice of connecting devices in a chain, where each device connects to the next.

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Point-to-Point Connection

A type of connection that uses a single cable to connect the motherboard to a hard drive, eliminating the need for daisy chaining and terminators.

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Serial Attached SCSI (SAS) Array

A specialized connection designed for connecting multiple SAS drives into a single chassis.

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Bus Connectivity

The ability of a device to be connected to a bus, allowing it to send and receive information.

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Data Transfer

A unit of information that is sent or received over a communication line.

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Throughput

The maximum rate at which data can be transmitted between devices, measured in megabytes per second (MBps).

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Communication Protocol

The ability to manage and control the communication between devices, ensuring proper information flow.

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Study Notes

SCSI (Small Computer Systems Interface) Overview

  • SCSI is a standard for connecting storage devices, scanners, printers, and other peripherals to a computer.
  • It allows multiple devices to be connected via daisy-chaining to a single interface, with some standards supporting up to 16 devices per chain.
  • SCSI has numerous standards with differing interfaces and cables.
  • iSCSI (SCSI over IP) is a newer standard, commonly used in virtual networks.
  • SCSI supports both parallel (e.g., PATA) and serial (e.g., SATA) connectivity.
  • SCSI was prevalent before widespread use of SATA and USB, connecting devices like scanners, CD-ROMs, and tape backups.
  • Systems with SCSI interfaces are still found, commonly in virtual environments.

SCSI Characteristics

  • SCSI is an intelligent interface; it automatically identifies and manages connected devices.
  • SCSI devices are assigned unique IDs (SCSI ID) to differentiate them. A computer may be assigned ID 0, a hard drive ID 2, and so on.
  • Logical Unit Numbers (LUNs) allow for identification of individual drives within a drive array.

Physical Characteristics & Connectors

  • SCSI connectors come in various forms (e.g., 68-pin Ultra 3).
  • SCSI cables have connectors to link devices, with a terminator often necessary at the final device on the chain.
  • Older standards often needed manual configuration.
  • Newer serial attached SCSI standards (like SAS) simplify setups.

SCSI vs. Newer Technologies

  • Newer standards like Serial Attached SCSI (SAS) offer simplified setups without the need for manual configuration (SCSI IDs and terminators).
  • SAS significantly improved data throughput and simplified implementations in modern computers.
  • SAS devices are point-to-point connections between the controller and the drive, removing daisy chains and the need for terminators.

External SCSI Devices

  • External SCSI devices often have power inputs and a cooling system.
  • SCSI devices, even external ones, often have buttons to change device IDs.

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Description

Explore the fundamentals of SCSI, the standard for connecting storage devices and peripherals to computers. This quiz covers SCSI features, its various standards, and its role in modern systems, including SCSI ID management and iSCSI in virtual environments.

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