How to hot-add RAM and hot-plug vCPUs to your vSphere VMs in different environments
Sometimes, you badly need to provide your VMware VMs with more RAM or vCPUs without shutting them down. True, there’s a trick allowing you to do that – CPU Hot-Plug and Memory Hot-Add. In this article, I’ll discuss both these features and how to use them in different environments.
Why do I write an article about Hot-Plug and Hot-Add in 2018 even though they were introduced back in ESXi 4.0? You see, there are very few in-depth studies of how Hot-Add and Hot-Plug work in different environments for some reasons. Sure, you can find a bunch of good articles about how you enable those features, why you need them, and when you may just want to leave them disabled (yes, they are disabled by default). There were some studies held for Windows guest OS family, but there is very few known about how Hot-Add/Hot-Plug work in Linux. Well, I hope to fill that gap with this article.