Operating System Concepts: Virtual File Systems

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What is the main advantage of Contiguous Allocation?

Best performance in most cases. (correct)
Easy to implement.
Good for small files only.
No external fragmentation.

What is a problem associated with Contiguous Allocation?

Finding space for files (correct)
Implementing the algorithm
Slow disk access
Security vulnerabilities

What is an extent in Extent-Based Systems?

A type of fragmentation
A file system structure
A single disk block
A contiguous block of disks (correct)

What is a disadvantage of Linked Allocation?

Reliability can be a problem (A) Signup and view all the answers

What is the main advantage of Linked Allocation?

No external fragmentation (A) Signup and view all the answers

What is the purpose of a free space management system in Linked Allocation?

To manage disk space efficiently (B) Signup and view all the answers

How does a FAT (File Allocation Table) variation work?

It uses a table to index block numbers (C) Signup and view all the answers

What is the purpose of a vnode in Virtual File Systems?

To hold inodes or network file details (A) Signup and view all the answers

What is the main idea behind Virtual File Systems?

To provide a common interface for different file systems (D) Signup and view all the answers

What is the purpose of a function table in VFS?

To hold addresses of routines to implement functions (C) Signup and view all the answers

What is the primary purpose of consistency checking?

To fix inconsistencies between directory structure and data blocks on disk (A) Signup and view all the answers

What is the main advantage of log-structured file systems?

Faster recovery from crashes and reduced chance of metadata inconsistency (D) Signup and view all the answers

What is the primary function of the NFS protocol?

To enable remote access to files across LANs or WANs (B) Signup and view all the answers

What is the purpose of the mount operation in NFS?

To create a logical connection between client and server, enabling file access (B) Signup and view all the answers

What is the function of the export list in NFS?

To specify remote file systems that a server exports for mounting (C) Signup and view all the answers

What is the primary purpose of the file handle in NFS?

To identify the mounted directory within the exported file system (A) Signup and view all the answers

What is the benefit of using RPC (Remote Procedure Call) in NFS?

Independence from specific machine and network architectures (D) Signup and view all the answers

What is the primary advantage of using XDR (External Data Representation) in NFS?

Independence from specific machine and network architectures (B) Signup and view all the answers

What is the purpose of the mount request in NFS?

To specify the remote directory to be mounted (A) Signup and view all the answers

What is the benefit of using NFS in a heterogeneous environment?

Ability to share files among different machines and operating systems (C) Signup and view all the answers

What is the primary purpose of the Virtual File System (VFS) layer in the NFS architecture?

To distinguish between local and remote files (D) Signup and view all the answers

In the NFS protocol, how are modified data committed to the server's disk?

Before results are returned to the client (D) Signup and view all the answers

What is the primary advantage of using a directory name lookup cache in NFS?

Faster lookup times for remote directory names (D) Signup and view all the answers

What is the purpose of the file-attribute cache in NFS?

To validate cached file attributes (D) Signup and view all the answers

What is the primary difference between the NFS protocol and NFS V4?

NFS V4 is a stateful protocol, while NFS is stateless (B) Signup and view all the answers

What is the primary purpose of the WAFL file system?

To provide a distributed file system for Network Appliance devices (D) Signup and view all the answers

What is the purpose of the snapshot feature in the WAFL file system?

To provide a backup mechanism for files (C) Signup and view all the answers

What is the primary concern in free-space management?

Maintaining a consistent view of free space between disk and memory (B) Signup and view all the answers

What is the purpose of the bit map in free-space management?

To track free space on disk (C) Signup and view all the answers