VMware notes.
Interesting. Here’s how to hot add CPU and RAM to a running VM in VMware. Note, however, that this requires proper operating system support, and some old RHEL doesn’t work with it.
20180323/https://www.unixarena.com/2014/11/dynamically-adding-memory-cpu-to-vmware-vm.html
20180323/https://access.redhat.com/solutions/165403
20180323/