W.50001 [W.50001]
Explanation: A DIMM has been disabled due to an error detected during POST. DIMM Disabled
Severity: Info
User response: Complete the following steps:
1. If the DIMM was disabled because of a memory fault, follow the procedure for that event.
2. If no memory fault is recorded in the logs and no DIMM connector error LEDs are lit, re-enable the DIMM
through the Setup utility or the Advanced Settings Utility (ASU).
3. If the problem persists, Power cycle the compute node from the management console.
4. Reset the IMM to default settings.
5. Reset UEFI to default settings.
6. Update IMM and UEFI firmware.
7. Swap/reseat the DIMM from the disabled slot with a matching DIMM. If the slot remains disabled, (trained
technician only) replace system board
W.58001 [W.58001]
Explanation: The PFA Threshold limit (correctable error logging limit) has been exceeded on DIMM number % at
address %. MC5 Status contains % and MC5 Misc contains %. DIMM PFA Threshold Exceeded
Severity: Error
User response: Complete the following steps:
1. If the compute node has recently been installed, moved, serviced, or upgraded, verify that the DIMM is properly
seated and visually verify that there is no foreign material in any DIMM connector on that memory channel. If
either of these conditions is found, correct and retry with the same DIMM. (Note: The event Log might contain a
recent 580A4 event denoting detected change in DIMM population that could be related to this problem.)
2. Check the IBM support site for an applicable firmware update that applies to this memory error. The release
notes will list the known problems the update addresses.
3. If the previous steps do not resolve the problem, at the next maintenance opportunity, swap the DIMMs on the
same memory channel one at a time to a different memory channel or Processor. (check service information for
this product/Install guide for population requirements for sparing/paring modes). If PFA follows a moved DIMM
to any DIMM connector on the different memory channel, replace the moved DIMM.
4. If no problem is observed on the DIMM connectors and the problem persists, replace the DIMM identified by
LightPath and/or event log entry.
5. If problem re-occurs on the same DIMM connector, swap the other DIMMs on the same memory channel across
channels one at a time to a different memory channel or Processor. (check service information for this
product/Install guide for population requirements for sparing/paring modes). If problem follows a moved DIMM
to a different memory channel, replace that DIMM.
6. (Trained service technician only) Remove affected Processor and inspect Processor socket pins for damaged or
mis-aligned pins. If damage is found, or this is an upgrade Processor, replace the system board. If there are
multiple Processor’s, swap Processor’s to move affected Procesor to another Processor socket and retry. If problem
follows the affected Processor (or there is only one Processor), replace the affected Processor.
7. (Trained technician only)If problem stays with the original DIMM connector, re-inspect DIMM connector for
foreign material and remove, if found. If connector is damaged, replace system board
W.50001 • W.58001
Appendix B. UEFI/POST diagnostic codes 835
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