Well one of the killers I found very recently was if you open the console of the VM before it has booted it sets the caps lock on which instantly shafts entry o

Well one of the killers I found very recently was if you open the console of the VM before it has booted it sets the caps lock on which instantly shafts entry of the grub commmand line so initial configuration of that is pissing in the dark because you can’t observe it without affecting it. Then there’s the periodic refusal to talk on the network even if the virtual switches are configured properly. Then the inexplicable “slow boot from hell” which happens randomly where it’ll just hang starting up the kernel at 0% CPU for up to 8 minutes. This is with CentOS 7 on a gen2 machine.