ESX(i) installations on HP systems require the HP NMI driverESX 4.1 instances on HP systems require the HP NMI driver to ensure proper handling of non-maskable interrupts (NMIs). The NMI driver ensures that NMIs are properly detected and logged. Without this driver, NMIs, which signal hardware faults, are ignored on HP systems with ESX. Workaround: Download and install the NMI driver. The driver is available as an offline bundle from the HP Web site. Also, see KB 1021609.