Inconsistencies Between Dimm Fault Indicators And The Bios Isolation Of Faulty Dimms; Identify And Remove A Faulty Dimm - Oracle X7-8 Service Manual

Quad-rank LRDIMM: 4Rx4
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Dual-rank RDIMM: 2Rx4
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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 service processor Oracle ILOM system 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.

Identify and Remove a Faulty DIMM

1. Use Oracle ILOM to identify the location of the failed DIMM and obtain CMOD
designation information.
See "Troubleshooting Server Hardware Faults" on page
2. Prepare the server for warm service.
See "Preparing the Server for Component Replacement" on page
This procedure can also be completed as a cold service procedure.
Note -
Remove the CMOD that contains the failed DIMM.
3.
See "Remove a CMOD" on page
4. Remove the CMOD top cover.
See "Remove the CMOD Cover" on page
To remove the CMOD top cover, push the release button, slide the CMOD cover toward the
back of the CMOD, and lift it away.
Identify and note the location of the faulty DDR4 DIMM by pressing the Fault
5.
Remind button on the motherboard.
Faulty DIMMs are identified with a corresponding amber LED on the motherboard.
46.
162.
164.
Identify and Remove a Faulty DIMM
100.
Servicing Components 189