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Deepin Linux
Deepin Linux
May 22, 2025 · Operations

Understanding Buffers and Cache in Linux Memory Management

This article explains the concepts, working principles, and system parameters of Linux buffers and cache, compares their roles in read/write operations, and provides practical vmstat and dd command examples to illustrate how they affect memory usage and I/O performance.

BufferCacheLinux
0 likes · 19 min read
Understanding Buffers and Cache in Linux Memory Management
Raymond Ops
Raymond Ops
May 4, 2025 · Operations

How to Safely Clone an Ubuntu System Disk with dd: Step‑by‑Step Guide

This article provides a comprehensive, step‑by‑step guide on using the low‑level dd tool to back up and restore an Ubuntu system disk, covering prerequisites, preparation, command examples, optional compression, feasibility analysis, precautions, and a concise conclusion.

Linux operationsLiveUSBdd
0 likes · 7 min read
How to Safely Clone an Ubuntu System Disk with dd: Step‑by‑Step Guide
Efficient Ops
Efficient Ops
May 18, 2020 · Operations

Why Do Files Disappear After a Cloud VM Restart? Common Pitfalls and Fixes

This article outlines five typical cloud‑host file‑loss scenarios—including tmpfs data loss after reboot, accidental rm commands, and disk damage from fio or dd—explains their causes, and provides practical prevention and recovery recommendations for operations engineers.

cloudddfile loss
0 likes · 10 min read
Why Do Files Disappear After a Cloud VM Restart? Common Pitfalls and Fixes
NetEase Game Operations Platform
NetEase Game Operations Platform
Jan 4, 2020 · Operations

Ceph Storage Failure Recovery: Analysis and Step‑by‑Step Procedures

This article describes a real‑world Ceph storage incident caused by disk bad sectors, analyzes its impact, and presents two practical recovery methods—full disk copy with dd+nc and skipping the faulty sector during service start—along with detailed commands and post‑recovery steps.

CephFailure RecoveryLinux
0 likes · 11 min read
Ceph Storage Failure Recovery: Analysis and Step‑by‑Step Procedures