Deep Dive into Enterprise IT
Virtual LAN (VLAN) Although VLAN emerged before virtualization and is not part of virtualization topic. I’d just like to start from here as a refresher. Suppose we have computers from finance department and computers from sales department all connected to a single layer-2 switch. There are at least three problems: 1) too many devices on … Read moreVirtualization 4 of 4 – Networking
We covered hypervisor in previous post. In this article we focus on the virtualization of graphics computing resource. GPU vs CPU GPU is a specialized type of microprocessor primarily designed for quick image rendering. GPU appeared as a response to graphically intense applications that put a burden on the CPU and degrated computer performance. They … Read moreVirtualization 2 of 4 – Graphics Computing
In broad terms, virtualization of computing resource is about isolation of resources, at different levels. There are five levels of virtualization: In my context I deal mostly with OS level and HAL (hardware abstraction layer) level of virtualization. In loose terms, the word containerization refers to OS level virtualization, while the word virtualization is exclusively … Read moreVirtualization 1 of 4 – Hypervisor
Overview In 2015, Brendan Gregg posted two great articles on Netflix blog: Linux Performance Analysis in 60 seconds, and Linux Perfomrance Tools. They have great value when I was in a urgency to spot performance issues. The articles cover the essential tools for performance troubleshooting, including: We will dive into each of them in the … Read morePerformance Analysis
This is not for Linux snobs, but rather for those who are stuck with a Windows work laptop, have to deal with Linux on a daily basis, and are not a fan of PuTTY. This posting provides the steps to setup Windows 10 so you get a work environment closer to a Linux one. The … Read moreSetup WSL2 (and Docker) on Windows 10
This article is my experience with memory balloon on virtual machine. I came across an ElasticSearch server (ESXi guest with 32GB physical memory) where the main process keeps dying of OOM. Even worse, after the OOM event, the free memory left is about 10G and Elastic Search cannot start because its JVM is set with … Read moreBalloon steals memory from virtual machines