In ESX cluster with 3 host I have some WIndows 2003 Server Standard x64 machines with 16GB RAM.
In VM Settings "Windows 2003 Server x64 Standard" is selected. The recommended max RAM size by VMware is 4GB according to the menu when creating the machine. I assigned 16GB to my machines, because the OS I installed supports up to 32GB. Now the VM are performing very slow, time to boot ist up to 10 minutes. The VMs are creating heavy CPU Load on the Host when booting.
I changed the OS selection to "Windows 2003 Server x64 Enterprise". Now everything is fine.
What causes this behavior? Can it possibly be that ESX is only assigning the recommended RAM as physical RAM to the VM and the rest is swapped to the disk?
Even though you selected a x64 base operating system that is capable of handling 32gb of memory there are specific limitations on the template guest selected. Anytime you are using more than 4gb of memory
This article outlines why you need to choose a backup solution that protects your entire environment – including your VMware ESXi and Microsoft Hyper-V virtualization hosts – not just your virtual machines.
Teach the user how to install vSphere Update Manager
Console to Windows system: Install vSphere Update Manager: Configure vSphere Update Manager plug-in in vSphere Client: Verify vSphere Update Manager settings in vSphere Client:
Teach the user how to install and configure the vCenter Orchestrator virtual appliance
Open vSphere Web Client: Deploy vCenter Orchestrator virtual appliance OVA file: Verify vCenter Orchestrator virtual appliance boots successfully: Connect to the …