🚀 Stack Overflow’s Server Stack — still a performance beast!
(Oddly the page seems to be now deleted but I found it from the archived performance page 📜)
https://web.archive.org/web/20....250222092147/https:/

💡 Key Numbers:
📈 1.3 B page views/month
📦 55 TB data transferred/month

🖥 Web Layer:

9× web servers, each with 64 GB RAM 💪

🗄 Database Powerhouses:

4× SQL Servers → 2 clusters:

Stack Overflow cluster: 1.5 TB RAM, 2.8 TB DB 📊

Other sites cluster: 768 GB RAM, 3.9 TB DB

⚡ Caching:

Redis master + replica, each with 256 GB RAM for lightning-fast responses ⚡🧠

🏷 Tag Engine:

3 servers, 64 GB RAM each, keeping tags ultra-snappy 🏷✨

🔍 Search Layer:

3× Elasticsearch servers, 196 GB RAM each — finding that obscure answer in milliseconds 🔎