Field Notice: FN72074 – 64GB 2666MHz RDIMM Wear Out Failures – Replace on Failure

Problem Description
A limited number of 64GB DIMMs shipped from Cisco are impacted by a known deviation in the manufacturing process. This deviation might result in a higher rate of failure. A replacement is recommended.

Background
Cisco has identified an issue with a limited number of 64GB DIMMs manufactured within a single lot. This issue is confined to a specific set of DIMMs which can be identified by the serial number. Most of the affected DIMMs shipped in early 2019. Manufacturing process improvements have been established in order to prevent similar escapes.

Problem Symptom
DIMMs might exhibit correctable or uncorrectable errors. If encountered during runtime, uncorrectable errors might cause a sudden catastrophic server reset. If encountered during Power-On Self-Test (POST), the DIMM will be mapped out and the total available memory reduced.

This advisory can be found at the following link:
https://www.cisco.com/c/en/us/support/docs/field-notices/720/fn72074.html