Question 1

Disk controllers do not usually have a built-in cache.

Accepted Answer

A) True 
 B)False  False

Question 2

An I/O system call does not include

Accepted Answer

A)  memory address. 
B)  storage device address. 
C)  CPU speed. 
D)  whether the operation is input or output. 
A)  memory address. 
B)  storage device address. 
C)  CPU speed. 
D)  whether the operation is input or output. C

Question 3

Describe one technique that can enable multiple disks to be used to improve data transfer rate.

Accepted Answer

One technique is bit-level striping. Bit-level striping consists of splitting the bits of each byte across multiple disks so that the data can be accessed from multiple disks in parallel. Another method is block-level striping where blocks of a file are striped across multiple disks.

Question 4

What are the two components of positioning time?

Accepted Answer

A)  seek time + rotational latency 
B)  transfer time + transfer rate 
C)  effective transfer rate - transfer rate 
D)  cylinder positioning time + disk arm positioning time 
A)  seek time + rotational latency 
B)  transfer time + transfer rate 
C)  effective transfer rate - transfer rate 
D)  cylinder positioning time + disk arm positioning time

Question 5

Number of sectors per track increases as we move from inner zone to outer zone, because

Accepted Answer

A)  the drive can increase its rotation speed as the head moves from the outer to the inner tracks. 
B)  the drive can decrease its rotation speed as the head moves from the outer to the inner tracks. 
C)  angular velocity of disk rotation can vary. 
D)  angular velocity of disk rotation can remain constant. 
A)  the drive can increase its rotation speed as the head moves from the outer to the inner tracks. 
B)  the drive can decrease its rotation speed as the head moves from the outer to the inner tracks. 
C)  angular velocity of disk rotation can vary. 
D)  angular velocity of disk rotation can remain constant.

Question 6

Solid state disks (SSDs) commonly use the ___________ disk scheduling policy.

Accepted Answer

A)  C-SCAN 
B)  SCAN 
C)  FCFS 
D)  None of the above 
A)  C-SCAN 
B)  SCAN 
C)  FCFS 
D)  None of the above

Question 7

SCAN disk head scheduling offers no practical benefit over FCFS disk head scheduling.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is FALSE about swap space use?

Accepted Answer

A)  Swap space may be used to hold an entire process image. 
B)  Swap space may be used to store only pages that have been pushed out of main memory. 
C)  Swap space may be used to store the file system. 
D)  Swap space can be a dedicated swap partition, a swap file, or a combination of swap partitions and swap files. 
A)  Swap space may be used to hold an entire process image. 
B)  Swap space may be used to store only pages that have been pushed out of main memory. 
C)  Swap space may be used to store the file system. 
D)  Swap space can be a dedicated swap partition, a swap file, or a combination of swap partitions and swap files.

Question 9

DRAMs are now commonly used for mass data storage, because

Accepted Answer

A)  programs can share data easily when using RAMs. 
B)  DRAMs are cheaper than SSDs. 
C)  programs may not need the data they store in future. 
D)  storage capacity of DRAMS is typically much larger than HDDs. 
A)  programs can share data easily when using RAMs. 
B)  DRAMs are cheaper than SSDs. 
C)  programs may not need the data they store in future. 
D)  storage capacity of DRAMS is typically much larger than HDDs.

Question 10

In general, SCAN disk head scheduling will involve less movement of the disk heads than C-SCAN disk head scheduling.

Accepted Answer

A) True 
 B)False

Question 11

RAID level ____ is the most common parity RAID system.

Accepted Answer

A)  0 
B)  0+1 
C)  4 
D)  5 
A)  0 
B)  0+1 
C)  4 
D)  5

Question 12

A full bootstrap program

Accepted Answer

A)  is stored in ROM to ensure to avoid any infection from viruses. 
B)  is part of an operating system 
C)  may be infected by viruses. 
D)  runs after the operating system has been loaded in memory. 
A)  is stored in ROM to ensure to avoid any infection from viruses. 
B)  is part of an operating system 
C)  may be infected by viruses. 
D)  runs after the operating system has been loaded in memory.

Question 13

RAID level 0 provides no redundancy.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following is FALSE about Storage Area Networks?

Accepted Answer

A)  SANs make it possible for clusters of servers to share the same storage. 
B)  SANs use storage protocols rather than network protocols. 
C)  Allocation of storage to hosts is static. 
D)  Multiple hosts can attach to the same SAN. 
A)  SANs make it possible for clusters of servers to share the same storage. 
B)  SANs use storage protocols rather than network protocols. 
C)  Allocation of storage to hosts is static. 
D)  Multiple hosts can attach to the same SAN.

Question 15

Which of the following disk head scheduling algorithms does not take into account the current position of the disk head?

Accepted Answer

A)  FCFS 
B)  C-SCAN 
C)  SCAN 
D)  All scheduling algorithms take into account the current position of the disk head 
A)  FCFS 
B)  C-SCAN 
C)  SCAN 
D)  All scheduling algorithms take into account the current position of the disk head

Question 16

What is a storage-area network?

Accepted Answer

A storage-area network (SAN) is a privat

Question 17

Disk scheduling algorithms in operating systems consider only seek distances, because

Accepted Answer

A)  rotational latency is insignificant compared to the average seek time. 
B)  modern disks do not disclose the physical location of logical blocks. 
C)  the operating systems may have other constraints such as writes may be more urgent than reads. 
D)  it is difficult to optimize seek time in disk hardware. 
A)  rotational latency is insignificant compared to the average seek time. 
B)  modern disks do not disclose the physical location of logical blocks. 
C)  the operating systems may have other constraints such as writes may be more urgent than reads. 
D)  it is difficult to optimize seek time in disk hardware.

Question 18

In a swap map in Linux

Accepted Answer

A)  counter value 0 indicates that the page slot is occupied by a swapped page. 
B)  counter value 5 indicates that the page slot is occupied and the page is shared by five processes. 
C)  counter value -1 indicates that the page slot is available. 
D)  counter value -5 indicates that the page slot was occupied by a page that was shared by five processes, and is now available. 
A)  counter value 0 indicates that the page slot is occupied by a swapped page. 
B)  counter value 5 indicates that the page slot is occupied and the page is shared by five processes. 
C)  counter value -1 indicates that the page slot is available. 
D)  counter value -5 indicates that the page slot was occupied by a page that was shared by five processes, and is now available.

Question 19

Consider a disk queue holding requests to the following cylinders in the listed order: 116, 22, 3, 11, 75, 185, 100, 87. Using the SCAN scheduling algorithm, what is the order that the requests are serviced, assuming the disk head is at cylinder 88 and moving upward through the cylinders?

Accepted Answer

A)  116 - 22 - 3 - 11 - 75 - 185 - 100 - 87 
B)  100 - 116 - 185 - 87 - 75 - 22 - 11 - 3 
C)  87 - 75 - 100 - 116 - 185 - 22 - 11 - 3 
D)  100 - 116 - 185 - 3 - 11 - 22 - 75 - 87 
A)  116 - 22 - 3 - 11 - 75 - 185 - 100 - 87 
B)  100 - 116 - 185 - 87 - 75 - 22 - 11 - 3 
C)  87 - 75 - 100 - 116 - 185 - 22 - 11 - 3 
D)  100 - 116 - 185 - 3 - 11 - 22 - 75 - 87

Question 20

Describe why Solaris systems only allocate swap space when a page is forced out of main memory, rather than when the virtual memory page is first created.

Accepted Answer

Solaris systems only allocate swap space

Disk controllers do not usually have a built-in cache.

An I/O system call does not include

Describe one technique that can enable multiple disks to be used to improve data transfer rate.

What are the two components of positioning time?

Number of sectors per track increases as we move from inner zone to outer zone, because

Solid state disks (SSDs) commonly use the ___________ disk scheduling policy.

SCAN disk head scheduling offers no practical benefit over FCFS disk head scheduling.

Which of the following is FALSE about swap space use?

DRAMs are now commonly used for mass data storage, because

In general, SCAN disk head scheduling will involve less movement of the disk heads than C-SCAN disk head scheduling.

RAID level ____ is the most common parity RAID system.

A full bootstrap program

RAID level 0 provides no redundancy.

Which of the following is FALSE about Storage Area Networks?

Which of the following disk head scheduling algorithms does not take into account the current position of the disk head?

What is a storage-area network?

Disk scheduling algorithms in operating systems consider only seek distances, because

In a swap map in Linux

Consider a disk queue holding requests to the following cylinders in the listed order: 116, 22, 3, 11, 75, 185, 100, 87. Using the SCAN scheduling algorithm, what is the order that the requests are serviced, assuming the disk head is at cylinder 88 and moving upward through the cylinders?

Describe why Solaris systems only allocate swap space when a page is forced out of main memory, rather than when the virtual memory page is first created.

Introduction

Operating-System Structures

Processes

Threads Concurrency

Cpu Scheduling

Synchronization Tools

Synchronization Examples

Deadlocks

Main Memory

Virtual Memory

Io Systems

File-System Interface

File-System Implementation

File-System Internals

Security

Protection

Filters

Exam 11: Mass-Storage Structure

Disk controllers do not usually have a built-in cache.

An I/O system call does not include

Describe one technique that can enable multiple disks to be used to improve data transfer rate.

What are the two components of positioning time?

Number of sectors per track increases as we move from inner zone to outer zone, because

Solid state disks (SSDs) commonly use the ___________ disk scheduling policy.

SCAN disk head scheduling offers no practical benefit over FCFS disk head scheduling.

Which of the following is FALSE about swap space use?

DRAMs are now commonly used for mass data storage, because

In general, SCAN disk head scheduling will involve less movement of the disk heads than C-SCAN disk head scheduling.

RAID level ____ is the most common parity RAID system.

A full bootstrap program

RAID level 0 provides no redundancy.

Which of the following is FALSE about Storage Area Networks?

Which of the following disk head scheduling algorithms does not take into account the current position of the disk head?

What is a storage-area network?

Disk scheduling algorithms in operating systems consider only seek distances, because

In a swap map in Linux

Consider a disk queue holding requests to the following cylinders in the listed order: 116, 22, 3, 11, 75, 185, 100, 87. Using the SCAN scheduling algorithm, what is the order that the requests are serviced, assuming the disk head is at cylinder 88 and moving upward through the cylinders?

Describe why Solaris systems only allocate swap space when a page is forced out of main memory, rather than when the virtual memory page is first created.

Introduction

Operating-System Structures

Processes

Threads Concurrency

Cpu Scheduling

Synchronization Tools

Synchronization Examples

Deadlocks

Main Memory

Virtual Memory

Io Systems

File-System Interface

File-System Implementation

File-System Internals

Security

Protection

Filters