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POP > Chap 11 > Flashcards

Chap 11 Flashcards

1
Q

Examples of human-readable external I/O devices are printers, terminals, and keyboards.

A

TRUE

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2
Q

The use to which a device is put does not have an influence on the software and policies in the operating system and supporting utilities.

A

FALSE

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3
Q

Direct memory access is the dominant form of transfer that must be supported by the operating system.

A

TRUE

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4
Q

The hierarchical philosophy is that the functions of the operating system should be separated according to their complexity, their characteristic time scale, and their level of abstraction.

A

TRUE

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5
Q

The actual queuing and scheduling of I/O operations occurs at the logical I/O module.

A

FALSE

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6
Q

Access rights are managed at the physical organization layer.

A

FALSE

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7
Q

Double buffering is when a process transfers data to (or from) one buffer while the operating system empties (or fills) the other.

A

TRUE

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8
Q

RAID 0 provides real-time backups of all data so that in the event of a disk failure, all of the critical data is still immediately available.

A

FALSE

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9
Q

The SCAN policy favors jobs whose requests are for tracks nearest to both innermost and outermost tracks, and favors the latest arriving jobs.

A

TRUE

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10
Q

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

A

TRUE

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11
Q

Windows has no way to support the encryption of entire volumes.

A

FALSE

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12
Q

Cache memory reduces average memory access time by exploiting the principle of locality.

A

TRUE

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13
Q

A key aspect of I/O is the use of buffers that are controlled by I/O utilities rather than by application processes.

A

TRUE

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14
Q

Two of the most widely used approaches to improve disk I/O performance are disk scheduling and disk cache.

A

TRUE

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15
Q

In the C-SCAN disk scheduling algorithm, the disk arm is required to move in one direction only until it reaches the last track or there are no more requests to service in that direction, then it reverses direction, and the scan proceeds in the opposite direction in the same fashion.

A

FALSE

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16
Q

The __________ category of external devices is suitable for communicating with the computer user.

A

human-readable

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17
Q

The __________ unit is capable of mimicking the processor and of taking over control of the system bus just like a processor.

A

direct memory access

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18
Q

__________ external devices are suitable for communicating with electronic equipment.

A

Machine-readable

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19
Q

The requested operations and data are converted into appropriate sequences of I/O instructions, channel commands, and controller orders at the __________ layer.

A

device I/O

20
Q

__________ external devices are suitable for communicating with modems.

A

Communication

21
Q

__________ is a technique that smoothes out peaks in I/O demand.

A

Buffering

22
Q

The advantage of _________ is that it provides extremely high data availability.

A

RAID 6

23
Q

The _________ technique is used on a Windows server to optimize the use of threads.

A

I/O completion ports

24
Q

On a moveable-head system, the time it takes to position the head at the track is known as ________.

A

seek time

25
Q

The advantage of __________ is that it provides extremely high data availability.

A

RAID 6

26
Q

The __________ technique allows multiple simultaneous I/O requests against a single device or file.

A

signaling an event object

27
Q

__________ are an efficient way of making consistent snapshots of volumes so that they
can be backed up.

A

Shadow copies

28
Q

RAID 5 is organized in a similar fashion to _________, but is different in the fact that RAID 5 distributes the parity strips across all disks.

A

RAID 4

29
Q

The disk scheduling algorithm that implements two sub-queues in a measure to avoid the problem of “arm stickiness” is the __________.

A

FSCAN policy

30
Q

The simplest type of support that the operating system can provide is _________.

A

single buffering

31
Q

External devices that engage in I/O with computer systems are grouped into three categories: human readable, machine-readable, and __________.

A

Communication

32
Q

Disk drives, USB keys, sensors, and controllers are examples of __________ external I/O devices.

A

Machine Readable

33
Q

A __________ module controls the exchange of data between main memory and an I/O module.

A

Direct Memory Access

34
Q

Two objectives are paramount in designing the I/O facility: generality and __________.

A

Efficiency

35
Q

The __________ module deals with the device as a logical resource and is not concerned with the details of actually controlling the device.

A

Logical I/O

36
Q

The _________ layer deals with the logical structure of files and with the operations that can be specified by users, such as open, close, read, and write.

A

File System

37
Q

At the _________ layer, symbolic file names are converted to identifiers that either reference
the file directly or indirectly through a file descriptor or index table.

A

Directory Management

38
Q

The __________ policy is to select the disk I/O request that requires the least movement of
the disk arm from its current position.

A

Shortest service time first

39
Q

A __________ transfers data in and out as a stream of bytes, with no block structure.

A

stream-orientated device

40
Q

When more than two buffers are used, the collection of buffers is itself referred to as a __________, with each individual buffer being one unit.

A

circular buffer

41
Q

The sum of the seek time and the rotational delay equals the __________, which is the time it takes to get into a position to read or write.

A

access time

42
Q

The simplest form of scheduling is ___________ scheduling, which processes items from the queue in sequential order.

A

FIFO

43
Q

A set of logically consecutive strips that maps exactly one strip to each array member is referred to as a __________.

A

stripe

44
Q

The term _________ is usually used to apply to a memory that is smaller and faster than main memory and that is interposed between the aid memory and the processor.

A

cache memory

45
Q

Windows supports two sorts of RAID configurations: Software RAID and ________.

A

hardware raid

POP (11 decks)

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