AFF A700s CECC: Correctable Machine Check Errors being reported against wrong DIMM

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Category:: aff-series

Specialty:: hw

Last Updated:

Applies to

AFF A700s
AFF 8080
FAS8200
All Flash FAS
ONTAP 9
- ONTAP 9.1P17 and earlier
- ONTAP 9.3P11 and earlier
- ONTAP 9.4P6 and earlier

Issue

The CECC error is reported in the same DIMM even after a replacement:

The system health alert show command reports errors similar to the following on the cluster:

Node xxxxxx Monitor controller Alert ID CriticalCECCCountMemErrAlert Alerting Resource DIMM-x Subsystem Memory Indication Time Tue Oct 09 12:24:36 2018 Perceived Severity Critical Probable Cause DIMM_Degraded Description The DIMM has degraded, leading to memory errors.

The following are corrective actions:

1. Contact technical support to obtain a new DIMM of the same specification

2. If possible, perform a takeover of this node and bring the node down for maintenance

3. Refer to the DIMM replacement guide for your given hardware platform to replace the DIMM

4. Bring the storage system online

Possible Effect: Memory issues can lead to a catastrophic system panic, which can lead to data downtime on the node.

The EMS log displays a message similar to the following, reporting CECC error on the specific DIMM:

[?] Tue Oct 09 12:24:36 IST [xxxx: mgwd: callhome.hm.alert.critical:alert]: Call home for Health Monitor process nphm: CriticalCECCCountMemErrAlert[DIMM-x].

Normally, a replacement of this DIMM is suggested.
However, even after the replacement, the errors in the same DIMM might be reported by the cluster.