Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
MCA Articles
Page 5 of 95
Storage Area Networks
Storage Area Networks (SANs) are specialized high-speed networks that provide block-level access to consolidated storage devices. Unlike traditional file-based storage access, SANs make storage devices appear as locally attached drives to servers, enabling multiple systems to share storage resources efficiently. SANs are widely adopted across organizations of all sizes due to their cost-effectiveness and scalability. They separate storage resources from individual servers, creating a dedicated storage infrastructure that can be managed centrally. Storage Area Network Architecture Host Layer Server 1 ...
Read MoreBeowulf Clusters
Beowulf clusters are high-performance computing systems built from commodity hardware − normal, identical computers connected through a local area network (LAN). These clusters use specialized software to distribute processing tasks across multiple nodes, creating a cost-effective parallel processing unit from standard personal computers. The concept originated in 1994 when Thomas Sterling and Donald Becker built the first Beowulf cluster at NASA. The name "Beowulf" was borrowed from the famous Old English epic poem, and has since become synonymous with clusters built from commodity hardware running open-source software. Beowulf Cluster Architecture ...
Read MoreUser Mode vs Kernel Mode
User mode and kernel mode are two distinct operating modes that ensure system security and stability. The CPU switches between these modes to control access to system resources and prevent unauthorized operations that could crash the system or compromise security. User Mode In user mode, applications run with restricted privileges and cannot directly access hardware or critical system resources. When a user program needs system services (like file I/O or memory allocation), it must request help from the operating system through system calls. The mode bit is set to 1 in user mode. Key characteristics include: ...
Read MoreSupervisor Mode (Privileged Mode)
Supervisor mode (also called privileged mode or kernel mode) is a computer system execution mode in which the processor can execute all instructions, including privileged instructions. These special instructions include interrupt management, I/O operations, memory management, and system configuration commands that are restricted from normal user programs. The privilege levels of different components in a system form a hierarchical structure − System Privilege Levels Kernel Mode (Ring 0) Highest Privilege Device Drivers (Ring 1-2) Limited Privilege ...
Read MoreReal-Time Embedded Systems
Real-time embedded systems are specialized computing systems that combine the strict timing requirements of real-time systems with the dedicated functionality of embedded systems. These systems must respond to external events within specific time constraints while performing dedicated tasks within larger systems. A real-time system operates under strict time constraints and provides worst-case time estimates for critical operations. An embedded system provides specific functionality within a larger system. When these two concepts merge, we get a real-time embedded system that must meet both timing deadlines and perform specialized tasks reliably. Types of Real-Time Embedded Systems Real-time embedded systems ...
Read MoreOpen Source Operating Systems
Open Source operating systems are released under a license where the copyright holder allows others to study, change, and distribute the software to other people for any reason. These systems provide transparency, community collaboration, and freedom from licensing fees, making them popular choices for developers, researchers, and organizations. Types of Open Source Operating Systems Desktop and General-Purpose Systems Cosmos Cosmos (C# Open Source Managed Operating System) is an open source operating system written primarily in C#. Rather than being a fully-fledged operating system, Cosmos serves as a toolkit that allows developers to easily build their own ...
Read MoreTraditional Computing vs Mobile Computing
Mobile Computing deals with human-computer interaction using mobile devices. It encompasses mobile hardware, software, and computing devices that operate within a mobile infrastructure. Unlike traditional computing systems that rely on fixed network topologies and wired protocols, mobile computing uses ad-hoc networks and wireless communication protocols to enable computing on the move. Mobile Computing Architecture Cloud Storage Internet Network Mobile Network Infrastructure ...
Read MoreKernel Data Structures
The kernel data structures are fundamental components that store and organize information about the current state of the system. When a new process is created, for example, a kernel data structure is established to contain all relevant process details including memory allocation, execution state, and resource usage. Most kernel data structures are accessible only by the kernel and its subsystems, maintaining system security and integrity. They contain both actual data and pointers to other related data structures, creating an interconnected network of system information. Core Kernel Data Structures The kernel manages vast amounts of system information including ...
Read MoreClustered Systems
Clustered systems are computing environments that combine multiple independent computer systems (nodes) to work together as a single logical unit. Unlike parallel systems that have multiple CPUs within a single machine, clustered systems consist of separate computers connected through a network and sharing common storage resources. Architecture of Clustered Systems Clustered System Architecture Node 1 CPU + Memory Cluster Software Node 2 CPU + Memory ...
Read MoreApplication Programs vs System Programs
Computer programs are broadly categorized into two main types: application programs and system programs. These programs operate at different layers of the computer system hierarchy, each serving distinct purposes and user bases. Computer System Hierarchy Users Application Programs System Programs Operating System Hardware ...
Read More