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Node panic due to persistent DIMM ECC errors

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ontap-9
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hw
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Applies to

  • AFF and FAS systems
  • ONTAP 9

Issue

  • Node experience multiple panics and automatic HA (High Availability) takeover events.
    CLTFLT:HAGroupNotification from DCNETAFFBKCEUSPR1-02 (CONTROLLER TAKEOVER COMPLETE AUTOMATIC-Communication Error)
  • Repeated uncorrectable ECC (Error-Correcting Code) memory errors reported on DIMM (Dual In-line Memory Module) slot, even after prior DIMM replacement.
Mon Aug 3 19:43:20 2026 SRAM record type (CPU) from DataONTAP: socket (1) core (12) bank (7)
Mon Aug 3 19:43:20 2026 SRAM record type (LOG) from DataONTAP: UECC Addr 0x6xxx9b80
Mon Aug 3 19:43:20 2026 SRAM record type (DIMM) from DataONTAP: slot (13)
  • After replacement of DIMM, errors recurred with a new DIMM at a different address.
Thu Mar 1 01:35:23 2026 SRAM record type (CPU) from DataONTAP: socket (0) core (0) bank (7)
Thu Mar 1 01:35:23 2026 SRAM record type (LOG) from DataONTAP: UECC Addr 0x8x0
Thu Mar 1 01:35:23 2026 SRAM record type (DIMM) from DataONTAP: slot (2)

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