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Failover

Failover ek automatic switching mechanism hai jahan jab primary system (server, database, network)…

Overview
🌟

Failover — Quick Facts

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Property: Detail

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Full Name: Failover

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Category: High Availability, Disaster…

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Also Known As: Automatic Switchover, HA Failover

Topic 1
🤖

Kyun Zaroori Hai

💡

Downtime = money loss — Amazon ka…

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User trust — baar baar down hone…

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SLA compliance — 99.99% uptime ka…

🎯

Data protection — database fail…

Topic 2
📥 ⚙️ 🔬 💡

How Failover Works

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Heartbeat — periodic ping (every…

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Health check endpoint — /health…

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TCP/UDP probes — port availability…

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Application-level checks — actual…

Topic 3
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Types of Failover

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Primary active hai — sab traffic…

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Standby idle hai — sirf data sync…

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Failure par standby activate hota…

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Resource utilization: 50% (standby…

Topic 4
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Failover vs Failback

⚡ | Aspect | Failover | Failback | |---|---|---| | Direction | Primary → Standby | Standby…
Topic 5
📥 📥 🧠 🔬 💡 🎯

Database Failover

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Primary — write operations handle

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Replica — read operations +…

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Data continuously replicate hota…

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Primary write tabhi confirm karta…

Topic 6
🔮 📊 🔬

Server/Application Failover

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Load balancer periodic health…

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Unhealthy server ko pool se remove

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Traffic healthy servers par…

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Tools: Nginx, HAProxy, AWS ALB/NLB

Topic 7
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DNS Failover

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DNS level par failover — domain…

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Health check fail hone par DNS…

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Limitation: DNS TTL (Time-To-Live)…

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Best for: Global failover…

Topic 8
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RTO aur RPO

📊 | Metric | Full Form | Definition | Failover Connection | |---|---|---|---| | RTO |…
Topic 9
✨

Failover Comparison Table

🤖 | Type | Downtime | Data Loss | Cost | Complexity | Best For | |---|---|---|---|---|---|…
Topic 10
🧠 📊 🔬

Failover Architecture

🧠 `mermaid flowchart TD Client[Client Requests] --> LB[Load Balancer] LB -->…
Topic 11
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Best Practices

💡 1. Regular failover testing — production me plan karke failover test karo (chaos…
Comparison
✨

Failover vs Failback

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Direction: Primary → Standby

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When: Primary fail hota hai

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Trigger: Automatic/Manual

Comparison
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Failover Comparison Table

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Active-Passive (Auto): Seconds

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Active-Active: Near-zero

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Manual Failover: Minutes-Hours

Diagram
📥 ⚙️ 🔬 💡

Visual Flow

📊 Diagram visualization — details in narration
Related Topics

See Also

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High Availability

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Disaster Recovery

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Load Balancing

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Replication

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Redundancy

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Database

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 1

Failover ka sabse sahi definition kya hai?

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 2

Failover ka 'Full Name' kya hai?

Complete! 🎉
COMPLETE

Failover Complete!

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✅

Failover Complete

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High Availability

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