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Articles by Arnab Chakraborty
Page 168 of 377
File Allocation Table(FAT)
The File Allocation Table (FAT) is a file system used by operating systems to organize and manage files on storage devices. It maintains a table that maps each file to its physical location on the disk, tracking which clusters (groups of sectors) are allocated to files and which are available for use. Structure of FAT FAT consists of a sequence of entries, where each entry represents a cluster on the disk. A cluster is the smallest unit of disk space that can be allocated to a file. Each FAT entry contains information about the cluster's status and pointers ...
Read MoreFile Caching in Distributed File Systems
File caching is a technique that stores frequently accessed data in fast-access memory (cache) to reduce retrieval time from slower storage devices. In distributed file systems, where data spans multiple servers, file caching is essential for minimizing network latency and improving overall system performance by keeping copies of popular files closer to users. How File Caching Works When an application requests a file, the distributed file system first checks the local cache. If the file exists in cache (cache hit), it's returned immediately. If not (cache miss), the system retrieves the file from remote storage and stores a ...
Read MoreFile Model in Distributed Operating System
A distributed operating system manages resources across multiple networked computers. The file model in such systems defines how files are created, stored, accessed, and managed across the network. This involves complex considerations including file systems, data consistency, fault tolerance, and security. Understanding distributed file models is crucial for building scalable, reliable systems that can handle large amounts of data across multiple machines. Basic Concepts of File Model in Distributed Operating System File A file is a named collection of related data stored on storage devices such as hard drives, flash drives, or network storage. Files have characteristics ...
Read MoreFile Protection
File protection in an operating system is the process of securing files from unauthorized access, alteration, or deletion. It is critical for data security and ensures that sensitive information remains confidential and secure. Operating systems provide various mechanisms such as file permissions, encryption, access control lists, and auditing to protect files from both internal and external threats. What is File Protection? File protection refers to the various mechanisms and techniques used to secure files from unauthorized access, modification, or deletion. It involves controlling access to files, ensuring their security and confidentiality, and preventing data breaches. These protection mechanisms ...
Read MoreFile Sharing and Protection
File sharing is the practice of distributing or providing access to digital files between two or more users or devices. While it is a convenient way to share information and collaborate on projects, it also comes with risks such as malware and viruses, data breaches, legal consequences, and identity theft. Protecting files during sharing is essential to ensure confidentiality, integrity, and availability. File sharing refers to the process of sharing or distributing electronic files such as documents, music, videos, images, and software between two or more users or computers. It plays a vital role in facilitating collaboration and communication ...
Read MoreWhat is PID manager in Linux?
In Linux, when an executable stored on disk is called a program, and a program loaded into memory and running is called a process. A process is given a unique number called process ID (PID) that identifies that process to the system when it is started. If we ever need to kill a process, for example, we can refer to it by its PID. As each PID is unique, there is no ambiguity or risk of accidentally killing the wrong process (unless you enter the wrong PID). The PID manager is a kernel subsystem responsible for allocating, managing, and ...
Read MoreMicrosoft Interface Definition Language
Microsoft Interface Definition Language (MIDL) is a language used to define interfaces between client and server programs in distributed computing environments. MIDL enables developers to create standardized interface definitions that facilitate communication between different software components, whether they are running on the same machine or across a network. Definition The MIDL compiler is included with the Microsoft Platform Software Development Kit (SDK) and allows developers to create Interface Definition Language (IDL) files and Application Configuration Files (ACF) required for: Remote Procedure Call (RPC) interfaces for distributed computing COM/DCOM interfaces for component-based programming Type libraries for OLE ...
Read MoreFile system consistency checker
A file system consistency checker (FSCK) is a critical utility that examines file systems for errors and attempts to repair them. It scans for inconsistencies like corrupted files, broken directory structures, and damaged metadata. Running FSCK helps prevent data loss and maintains file system integrity, though it should always be performed with proper precautions including data backups. How File System Consistency Checkers Work FSCK operates by performing multiple passes through the file system structure, examining different components in each phase: FSCK Operation Flow Phase 1: ...
Read MoreWhat is the difference between context switching and interrupt handling?
Context switching and interrupt handling are two fundamental mechanisms in operating systems that manage how the CPU processes tasks. While both involve changing the CPU's execution state, they serve different purposes and operate at different levels of the system. Context Switching Context switching is the process of storing the complete state of a currently running process or thread and loading the state of another process to resume its execution. This mechanism enables multitasking by allowing a single CPU to be shared among multiple processes. During a context switch, the operating system saves the current process's state including ...
Read MoreWhat is marshalling in RPC?
Marshalling in RPC (Remote Procedure Call) is the process of converting procedure arguments and return values into a format suitable for network transmission. When a client makes a remote procedure call, the parameters must be packaged (marshalled) into a message, sent across the network, and then unpacked (unmarshalled) on the server side. How RPC Works Remote Procedure Call (RPC) is a client-server mechanism that enables an application on one machine to make a procedure call to code on another machine. The client calls a local procedure—a stub routine—that packs its arguments into a message and sends them across ...
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