Grading Checklist: Memory ECC Errors Increasing

A good response must include:

• Used mcelog --client or reviewed mcelog logs to identify the failing DIMM location
• Checked EDAC sysfs (/sys/devices/system/edac/mc/) for error counts per channel/DIMM
• Used dmidecode -t memory to identify the specific DIMM (slot, part number, serial)
• Assessed the error trend -- increasing CE rate is a strong predictor of imminent UE
• Confirmed no uncorrectable errors have occurred yet
• Planned DIMM replacement with a maintenance window (DIMMs are not hot-swappable)
• Proposed failing over the MySQL replica workload before the maintenance window
• Checked warranty status and initiated RMA/replacement process
• Considered running memtest86+ during the maintenance window to validate the replacement
• Documented the DIMM serial number and failure data for vendor RMA
• Recommended ongoing monitoring of ECC error rates across the fleet
• Assessed whether adjacent DIMMs on the same channel should be proactively tested