Question 1

Which of the following is TRUE about managing defective blocks?

Accepted Answer

A)  Defective blocks can be handled by OS by ensuring that the file system doesn't allocate those blocks. 
B)  Low level formatting can set aside spare sectors not visible to the operating system. 
C)  Controllers can be instructed to replace a bad block by moving all sectors following the defective sector one sector forward until a spare sector is reached. 
D)  All of the above. 
A)  Defective blocks can be handled by OS by ensuring that the file system doesn't allocate those blocks. 
B)  Low level formatting can set aside spare sectors not visible to the operating system. 
C)  Controllers can be instructed to replace a bad block by moving all sectors following the defective sector one sector forward until a spare sector is reached. 
D)  All of the above.

Question 2

In Solaris, swap space is only used as a backing store for pages of anonymous memory.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following is TRUE about NAS and Cloud storage?

Accepted Answer

A)  Cloud storage is accessed like a file system while NAS is API based. 
B)  In an event of temporary network disconnection, an application using NAS will typically hang while an application using cloud storage will typically pause. 
C)  Cloud storage is typically accessed over a LAN while NAS is accessed over a WAN. 
D)  All of the above. 
A)  Cloud storage is accessed like a file system while NAS is API based. 
B)  In an event of temporary network disconnection, an application using NAS will typically hang while an application using cloud storage will typically pause. 
C)  Cloud storage is typically accessed over a LAN while NAS is accessed over a WAN. 
D)  All of the above.

Question 4

What is a disadvantage of the FCFS scheduling algorithm?

Accepted Answer

FCFS can cause the disk head to move wil

Question 5

What is the advantage of C-SCAN over SCAN disk head scheduling?

Accepted Answer

The C-SCAN algorithm is a variant of SCA

Question 6

A hard disk drive has 16 platters, 8192 cylinders, and 256 4KB sectors per track. The storage capacity of this disk drive is at most

Accepted Answer

A)  128 TB. 
B)  32 TB. 
C)  32 GB. 
D)  128 GB. 
A)  128 TB. 
B)  32 TB. 
C)  32 GB. 
D)  128 GB.

Question 7

Solid state disks (SSDs) commonly use the FCFS disk scheduling algorithm.

Accepted Answer

A) True 
 B)False

Question 8

Describe an approach for managing bad blocks.

Accepted Answer

One approach to managing bad blocks is s

Question 9

Which of the following statement about device formatting is FALSE?

Accepted Answer

A)  Device manufacturers store the initial file-system data structures in the device. 
B)  Operating system can create multiple partitions with in a single device. 
C)  Volume creation is implicit when a file system is placed directly within a partition. 
D)  Not every partition contains a copy of the operating systems. 
A)  Device manufacturers store the initial file-system data structures in the device. 
B)  Operating system can create multiple partitions with in a single device. 
C)  Volume creation is implicit when a file system is placed directly within a partition. 
D)  Not every partition contains a copy of the operating systems.

Question 10

Consider a disk queue holding requests to the following cylinders in the listed order: 210, 67, 11, 99, 87, 90, 19, 150. Using the C-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)  87 - 90 - 99 - 67 - 19 - 11 - 150 - 210 
B)  210 - 67 - 11 - 99 - 87 - 90 - 19 - 150 
C)  90 - 99 - 150 - 210 - 11 - 19 - 67 - 87 
D)  90 - 99 - 150 - 210 - 87 - 67 - 19 - 11 
A)  87 - 90 - 99 - 67 - 19 - 11 - 150 - 210 
B)  210 - 67 - 11 - 99 - 87 - 90 - 19 - 150 
C)  90 - 99 - 150 - 210 - 11 - 19 - 67 - 87 
D)  90 - 99 - 150 - 210 - 87 - 67 - 19 - 11

Question 11

What is constant angular velocity in relation to disk drives?

Accepted Answer

If the rotation speed of a disk is to re

Question 12

If a few bits in an HDD sector or NVM page are corrupted, the controller can recover the correct values using ECC only if

Accepted Answer

A)  the bit corruption is limited to the data portion of the sector/page. 
B)  the bit corruption hasn't occurred in the ECC of the sector/page. 
C)  the bit corruption hasn't occurred in the ECC or the header of the sector/page. 
D)  number of bits corrupted is low irrespective of where the corruption occurs in the sector/page. 
A)  the bit corruption is limited to the data portion of the sector/page. 
B)  the bit corruption hasn't occurred in the ECC of the sector/page. 
C)  the bit corruption hasn't occurred in the ECC or the header of the sector/page. 
D)  number of bits corrupted is low irrespective of where the corruption occurs in the sector/page.

Question 13

The SCAN scheduling algorithm ____.

Accepted Answer

A)  services the request with the minimum seek time 
B)  services the request next to the current head position in the direction of the head movement 
C)  chooses to service the request furthest from the current head position 
D)  services the request next to the current head position in the opposite direction of the head movement 
A)  services the request with the minimum seek time 
B)  services the request next to the current head position in the direction of the head movement 
C)  chooses to service the request furthest from the current head position 
D)  services the request next to the current head position in the opposite direction of the head movement

Question 14

To further optimize I/O performance, some SSD schedulers

Accepted Answer

A)  merge adjacent read requests but not adjacent write requests. 
B)  merge adjacent write requests but not adjacent read requests. 
C)  merge all adjacent I/O requests. 
D)  do not merge requests at all. 
A)  merge adjacent read requests but not adjacent write requests. 
B)  merge adjacent write requests but not adjacent read requests. 
C)  merge all adjacent I/O requests. 
D)  do not merge requests at all.

Question 15

Compared to USB, NVMe provides

Accepted Answer

A)  both higher throughput and lower latency. 
B)  higher throughput, but higher latency. 
C)  lower latency, but lower throughput. 
D)  neither higher throughput and lower latency. 
A)  both higher throughput and lower latency. 
B)  higher throughput, but higher latency. 
C)  lower latency, but lower throughput. 
D)  neither higher throughput and lower latency.

Question 16

Difference between sector sparing and sector slipping is

Accepted Answer

A)  sector sparing uses spare sectors while sector slipping does not. 
B)  sector sparing results in copying of a single sector while sector slipping may result in copying of multiple sectors. 
C)  sector sparing can help recover from hard errors while sector slipping cannot. 
D)  sector slipping can help recover from hard errors while sector sparing cannot. 
A)  sector sparing uses spare sectors while sector slipping does not. 
B)  sector sparing results in copying of a single sector while sector slipping may result in copying of multiple sectors. 
C)  sector sparing can help recover from hard errors while sector slipping cannot. 
D)  sector slipping can help recover from hard errors while sector sparing cannot.

Question 17

A Flash Translation Layer

Accepted Answer

A)  translates user data to a format that can be written on the NVM. 
B)  tracks which physical block contains the most number of consecutive invalid pages. 
C)  tracks which physical block contains only valid pages. 
D)  tracks which physical block contains only invalid pages. 
A)  translates user data to a format that can be written on the NVM. 
B)  tracks which physical block contains the most number of consecutive invalid pages. 
C)  tracks which physical block contains only valid pages. 
D)  tracks which physical block contains only invalid pages.

Question 18

What are the factors influencing the selection of a disk-scheduling algorithm?

Accepted Answer

Performance of a scheduling algorithm de

Question 19

A track is the smallest unit of data transfer in a hard disk drive.

Accepted Answer

A) True 
 B)False

Question 20

Describe how Solaris ZFS file system uses checksums to maintain the integrity of data.

Accepted Answer

ZFS maintains checksums of all

Which of the following is TRUE about managing defective blocks?

In Solaris, swap space is only used as a backing store for pages of anonymous memory.

Which of the following is TRUE about NAS and Cloud storage?

What is a disadvantage of the FCFS scheduling algorithm?

What is the advantage of C-SCAN over SCAN disk head scheduling?

A hard disk drive has 16 platters, 8192 cylinders, and 256 4KB sectors per track. The storage capacity of this disk drive is at most

Solid state disks (SSDs) commonly use the FCFS disk scheduling algorithm.

Describe an approach for managing bad blocks.

Which of the following statement about device formatting is FALSE?

Consider a disk queue holding requests to the following cylinders in the listed order: 210, 67, 11, 99, 87, 90, 19, 150. Using the C-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?

What is constant angular velocity in relation to disk drives?

If a few bits in an HDD sector or NVM page are corrupted, the controller can recover the correct values using ECC only if

The SCAN scheduling algorithm ____.

To further optimize I/O performance, some SSD schedulers

Compared to USB, NVMe provides

Difference between sector sparing and sector slipping is

A Flash Translation Layer

What are the factors influencing the selection of a disk-scheduling algorithm?

A track is the smallest unit of data transfer in a hard disk drive.

Describe how Solaris ZFS file system uses checksums to maintain the integrity of data.

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

Which of the following is TRUE about managing defective blocks?

In Solaris, swap space is only used as a backing store for pages of anonymous memory.

Which of the following is TRUE about NAS and Cloud storage?

What is a disadvantage of the FCFS scheduling algorithm?

What is the advantage of C-SCAN over SCAN disk head scheduling?

A hard disk drive has 16 platters, 8192 cylinders, and 256 4KB sectors per track. The storage capacity of this disk drive is at most

Solid state disks (SSDs) commonly use the FCFS disk scheduling algorithm.

Describe an approach for managing bad blocks.

Which of the following statement about device formatting is FALSE?

Consider a disk queue holding requests to the following cylinders in the listed order: 210, 67, 11, 99, 87, 90, 19, 150. Using the C-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?

What is constant angular velocity in relation to disk drives?

If a few bits in an HDD sector or NVM page are corrupted, the controller can recover the correct values using ECC only if

The SCAN scheduling algorithm ____.

To further optimize I/O performance, some SSD schedulers

Compared to USB, NVMe provides

Difference between sector sparing and sector slipping is

A Flash Translation Layer

What are the factors influencing the selection of a disk-scheduling algorithm?

A track is the smallest unit of data transfer in a hard disk drive.

Describe how Solaris ZFS file system uses checksums to maintain the integrity of data.

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