--- title: "Amrit Poudel (@ambroligence) | Hashnode" description: "learner. Read the latest articles by Amrit Poudel on Hashnode." url: "https://hashnode.com/@ambroligence" --- @ambroligence # Amrit Poudel @ambroligence · Nepal Kathmandu · Joined May 2024 learner ### [🧯 PostgreSQL Production Incident: Understanding a Disk I/O Meltdown After a Holiday Backlog](https://systemtroubleshoot.hashnode.dev/postgresql-production-incident-understanding-a-disk-io-meltdown-after-a-holiday-backlog?utm_source=hashnode&utm_medium=feed) This article documents a real-world PostgreSQL production incident.All business names, schemas, queries, IPs, and identifiers have been anonymized for confidentiality. 📌 System Overview OS: Ubuntu Server 24.04 LTS Database: PostgreSQL 16.x CPU:... 6 min read · [systemtroubleshoot.hashnode.dev](https://systemtroubleshoot.hashnode.dev/postgresql-production-incident-understanding-a-disk-io-meltdown-after-a-holiday-backlog?utm_source=hashnode&utm_medium=feed) [Feb 16](https://hashnode.com/posts/postgresql-production-incident-understanding-a-disk-io-meltdown-after-a-holiday-backlog/6992cf188a4784bb34f2b15e) ### [2.reading iostat](https://disks.hashnode.dev/2reading-iostat?utm_source=hashnode&utm_medium=feed) Before talking about tuning or root cause, just answer one thing: What do these stats say is happening?Not why. Only what. Fictional iostat -x line Device r/s w/s rkB/s wkB/s await avgqu-sz %util sda 50 10 2000 400 30.... 5 min read · [disks.hashnode.dev](https://disks.hashnode.dev/2reading-iostat?utm_source=hashnode&utm_medium=feed) [Jan 27](https://hashnode.com/posts/2reading-iostat/69788adee9b89f617f5672b8) ### [Understanding Disks, Part 1: Why Disk I/O Even Exists](https://disks.hashnode.dev/understanding-disks-part-1-why-disk-io-even-exists?utm_source=hashnode&utm_medium=feed) Before you look at iostat, before you blame disks, before you scale hardware — you need one correct mental model. Let’s build it. Why does disk I/O even exist? A program never wants disk. A program wants data. Disk I/O happens only in two situations... 5 min read · [disks.hashnode.dev](https://disks.hashnode.dev/understanding-disks-part-1-why-disk-io-even-exists?utm_source=hashnode&utm_medium=feed) [Jan 27](https://hashnode.com/posts/understanding-disks-part-1-why-disk-io-even-exists/697859ba8e613a18940d6d7a) ### [AWS Fundamentals: Global Infrastructure and Core Services (Day 1 & Day 2)](https://awssolutionarchitectapprenticeship.hashnode.dev/aws-fundamentals-global-infrastructure-and-core-services-day-1-and-day-2?utm_source=hashnode&utm_medium=feed) Cloud computing is often presented as something abstract and magical. In reality, it is a set of very deliberate engineering decisions designed to solve scale, availability, and security problems.This article documents my Day 1 and Day 2 learning whi... 5 min read · [awssolutionarchitectapprenticeship.hashnode.dev](https://awssolutionarchitectapprenticeship.hashnode.dev/aws-fundamentals-global-infrastructure-and-core-services-day-1-and-day-2?utm_source=hashnode&utm_medium=feed) [Dec 28, 2025](https://hashnode.com/posts/aws-fundamentals-global-infrastructure-and-core-services-day-1-and-day-2/6950c38e08fad04b3e046f4b) ### [All you need to know about Nginx](https://eramritpoudel.hashnode.dev/all-you-need-to-know-about-nginx?utm_source=hashnode&utm_medium=feed) Nginx is a high performance web server developed to facilitate the increasing needs of the modern web. It focuses on high performance, high concurrency, and low resource usage. Although it's mostly known as a web server, NGINX at its core is a revers... 8 min read · [eramritpoudel.hashnode.dev](https://eramritpoudel.hashnode.dev/all-you-need-to-know-about-nginx?utm_source=hashnode&utm_medium=feed) [Sep 27, 2025](https://hashnode.com/posts/all-you-need-to-know-about-nginx/68d80c94eeb498c8625f9af5)