VMware introduced the capability to register for NMI events in ESX/ESXi 4.1 kernel.
HP is providing the HP NMI Driver (hpnmi) that will work with ESX/ESXi 4.1 kernel to log NMI info to HP Integrated Management Log (IML). Also ESX 4.1 kernel halts the server with PSOD - “Panic requested by 3rd party NMI handlers” to capture a kernel crash dump on panic after an NMI event is received.
If ESX/ESXi 4.1 does not have the HP NMI driver installed and in the event of a hardware fault, HP ProLiant systems may not shutdown due to the NMI event. The NMI event will be logged in the kernel logs and the system will continue execution.