Servicing the DIMMs
TABLE 7
DIMM Rank Classification Labels
Rank Classification Label
Quad-rank LRDIMM (not supported) 4Rx4
Dual-rank RDIMM 2Rx4
Single-rank RDIMM 1Rx4
Note - The Oracle Exadata Storage Server X5-2 High Capacity does not support Quad-Rank
LRDIMMs.
Inconsistencies Between DIMM Fault Indicators
and the BIOS Isolation of Faulty DIMMs
When a single DIMM is marked as failed by Oracle ILOM (for example, fault.memory.
intel.dimm.training-failed is listed in the SP Event Log), BIOS might disable the entire
memory channel that contains the failed DIMM, up to three 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 Storage Server Fault Remind Button
When the server Fault Remind button 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 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.
80 Oracle Exadata Storage Server X5-2 High Capacity Service Manual • January 2018
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