Inconsistencies Between DIMM Fault Indicators and the BIOS Isolation of Failed DIMMs
Inconsistencies Between DIMM Fault Indicators and the
BIOS Isolation of Failed DIMMs
When a single DIMM is marked as failed by Oracle ILOM (for example, fault.memory.
intel.dimm.training-failed is listed in the service processor Oracle ILOM event log), BIOS
might disable the entire memory channel that contains the failed DIMM, up to two DIMMs. As
a result, none of the memory installed in the disabled channel will be available to the operating
system. However, when the Fault Remind button is pressed, only the fault status indicator
(LED) associated with the failed DIMM lights. The fault LEDs for the other DIMMs in the
memory channel remain off. Therefore, you can correctly identify the failed DIMM using the lit
LED.
Using the Server Fault Remind Button
When the server Fault Remind button [1] is pressed, an LED located next to the Fault Remind
button lights green to indicate that there is sufficient voltage present in the fault remind circuit
to light any fault LEDs that were lit due to a component failure. If this LED does not light when
you press the Fault Remind button, it is likely that the capacitor powering the fault remind
circuit has lost its charge. This can happen if the Fault Remind button is pressed for several
minutes with fault LEDs lit or if power has been removed from the server for more than 15
minutes.
The following figure shows the location of the Fault Remind button.
Servicing the DIMMs (CRU) 127
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