This article explains the storage challenges of big data, introduces RAID levels and their trade‑offs, describes the HDFS architecture with NameNode and DataNode replication, details the MapReduce programming model and execution flow, and shows how Hive translates SQL queries into MapReduce jobs.
Learn how to set up a software RAID1 on a CentOS 7 VM using mdadm, covering environment preparation, partitioning, RAID creation, configuration file generation, filesystem formatting, mounting, and essential management commands, while highlighting performance considerations and common pitfalls.
This article introduces the fundamentals of Linux and open‑source software, covering GNU and GPL licensing, typical Linux distributions, Unix roots, swap partitions, GRUB bootloader, buffer vs cache, TCP three‑way handshake, filesystem hierarchy, hard/soft links, and an overview of RAID levels.
This comprehensive guide covers Linux operations interview topics, including the definition of ops, game‑ops roles, server management techniques, RAID levels, load‑balancing tools (LVS, Nginx, HAProxy), middleware, MySQL troubleshooting, backup solutions, health‑check configuration, common networking commands, virus removal, TCP/IP model, Nginx modules, log retention, system optimization, and useful command‑line shortcuts, all presented with clear explanations and practical examples.
This article provides a comprehensive overview of core Linux concepts, including the GNU project and GPL license, common distributions, swap partitions, GRUB bootloader, buffer vs cache, TCP three-way handshake, filesystem hierarchy, hard and soft links, and RAID technology.
This article explains how to evaluate storage performance by analyzing host ports, storage systems, and backend disks, discusses IO aggregation penalties, business workload models, RAID and cache impacts, and provides practical guidance for accurate performance assessment and tuning.
This article explains RAID fundamentals, compares common RAID levels, shows how to identify the configured RAID using MegaCli, evaluates write policies and battery status, and recommends optimal RAID configurations for MySQL data, binary logs, and redo files.
This guide presents practical Linux and server administration commands, covering log cleanup, nginx IP analysis, tcpdump capture, Python date formatting and string reversal, subprocess execution, multiprocessing, iptables port forwarding, cron scheduling, file relocation, RAID concepts, Oracle backup strategies, port checking, Apache MPM modes, and monitoring tool comparisons.
This article provides a detailed technical analysis of Huawei's Dorado V3 all‑flash storage system, explaining its classification, the GRIP (Granular management, ROW, Inline deduplication & compression, Parity RAID) and FAST (FlashLink, Active‑active, Zero‑loss snapshot, RAID‑TP) technologies, and why these features are essential for modern flash‑oriented solutions.
This guide explains why server IO utilization spikes above 60% during early‑morning hours, covering hardware self‑test, RAID battery failures, cache policy misconfigurations, and step‑by‑step commands for MegaRAID and HP servers, plus BIOS adjustments and best‑practice recommendations to prevent performance degradation.
This article explains how IO aggregation, RAID write penalties, and different business models such as OLTP, OLAP, VDI, and SPC‑1 affect storage performance, detailing FC bandwidth calculations, cache acceleration, and the impact of read/write ratios on RAID configurations to guide practical performance evaluation.
This article explains the basic concepts of disk read/write I/O operations, distinguishes random and sequential access, describes I/O size, IOPS calculation, RAID IOPS formulas, and provides guidance on evaluating storage performance for both individual disks and RAID arrays.
This article explains how to calculate the required capacity and performance for backup storage media, covering assumptions about data volume, retention policies, full and incremental backups, deduplication ratios, RAID configurations, and provides formulas to size storage and IOPS for reliable disaster recovery.
This article explores RAID and replication strategies in distributed storage, detailing stripe concepts, RAID0/1/10/5/6 configurations, the typical three‑node architecture with metadata and data servers, performance bottlenecks, reconstruction experiments, and practical mitigation techniques to ensure data integrity and high availability.
This guide explains how to improve MySQL server performance by applying BIOS tweaks, CPU and memory profile settings, disabling NUMA, choosing the right RAID level and cache options, selecting optimal filesystems and I/O schedulers, and adjusting Linux kernel parameters for maximum efficiency.
This article explains RAID technology, detailing each RAID level's design, performance trade‑offs, and reliability characteristics so readers can choose the most suitable configuration for their storage needs.
This article provides a comprehensive overview of RAID technology, explaining its purpose, the various standard levels from RAID 0 to RAID 6, hybrid configurations, non‑standard implementations like DRFS, and both software and firmware/driver based deployment methods.
This article explains how disk I/O performance impacts applications and introduces RAID technology, detailing common RAID levels such as RAID 0, RAID 1, RAID 5, and RAID 0+1, their performance characteristics, fault‑tolerance features, and appropriate use cases for improving throughput and data reliability.
This article explains what RAID is, compares common RAID levels with their advantages and disadvantages, and provides step‑by‑step Linux commands for creating, managing, and safely shutting down software RAID arrays using mdadm.
This article explains the concept, architecture, and trade‑offs of various RAID levels—including RAID 0, 1, 2, 3, 4, 5, 6, and hybrid configurations—detailing how they combine multiple inexpensive disks to achieve different balances of speed, capacity, and fault tolerance for server environments.
