If you lose access to the storage module from the host and the NEM fault LED comes on, check the following:
An over-temperature might have occurred. Check to ensure the chassis has proper cooling:
That data center air conditioning is on and chassis fans are functioning.
That all PCIe EM slots contain either a filler or a PCIe EM card.
That all chassis slots have either a blade or filler panel installed.
An internal component, such as the SAS expander, might be in an error state. Refer to SAS Path Disappears and ILOM /CH/NEMx/fault_state is "Faulted".