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Exam 7: Device Management

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Question 21

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The ____ is a hardware flag that must be tested by the CPU to determine when a device has completed an operation.

A) Channel Interrupt Word
B) Channel Status Word
C) Device Status Word
D) Device Polling Word

E) All of the above
F) B) and C)

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Question 22

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Device management principles are changing rapidly to accommodate cloud computing.

A) True
B) False

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Question 23

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Direct access storage devices (DASDs)are devices that can directly read or write to an arbitrary place on a disk.

RAID is a set of logical disk drives,viewed as a single physical unit by the operating system.

In the N-Step SCAN device-scheduling algorithm,any requests that arrive while the arm is in motion are grouped for the arm's next sweep.

____ time is the time required to move the arm of a movable-head magnetic drive into position over the proper track.

The universal serial bus (USB)controller acts as an interface between the operating system,device drivers,applications,and the devices that are attached via the USB host.

____ peripheral devices are assigned to only one job at a time.

Nested RAID levels,also called hybrid levels,are complex RAID configurations created by combining multiple standard levels.

The I/O ____ allocates the devices,control units,and channels.

The job of the I/O control unit is to keep up with the I/O requests from the CPU and pass them down the line to the appropriate control unit.

RAID Level 0 is not considered a true form of RAID because it cannot recover from hardware failure.

____ is a way to optimize search times on hard disk drives by ordering the requests once the read/write heads have been positioned.

To write data to flash memory,a relatively high voltage is sent through one transistor,called the ____,then through a metal oxide layer and into a second transistor called the control gate,where the charge is stored in a cell until it's erased.

A seek strategy for an I/O device handler is the predetermined policy that the device handler uses to allocate access to the device among the many processes that may be waiting for it.It determines the order in which the processes get the device;the goal is to keep transfer time to a minimum.

The Shortest Seek Time First device-scheduling algorithm moves the arm methodically from the inner to the outer track,servicing every request in its path.

RAID level ____ requires two different parity calculations.

A ____,used in RAID Level 2,is a coding scheme that adds extra,redundant bits to the data and is therefore able to correct single-bit errors and detect double-bit errors.

Of the three components of access time in a movable-head DASD,____ is the slowest.

Seek time is the fastest characteristic of a fixed-head disk drive.