Concept Guide

18 Memory Errors and Dell PowerEdge YX4X Server Memory RAS Features
• PowerEdge XR2
• PowerEdge R440
• PowerEdge R540
• PowerEdge R640
• PowerEdge R740
• PowerEdge R740xd
• PowerEdge R740xd2
• PowerEdge R840
• PowerEdge R940
• PowerEdge R940xa
• PowerEdge FC640
• PowerEdge M640
• PowerEdge MX740c
• PowerEdge MX840c
PowerEdge servers with Xeon E and AMD EPYC processors are not covered in this whitepaper.
Customers with these servers should continue to refer to v1.0 of the RAS whitepaper.
What’s New in BIOS 2.8.2
• Self-Healing on Uncorrectable Errors – Prior to this update, PowerEdge server BIOS was capable
of performing self-healing only whenever its health monitoring algorithms deemed it necessary.
With this PowerEdge server BIOS release, if the CPU detects an uncorrectable error, the server
will automatically schedule self-healing to occur on the next cold reboot of the server. Look for
MEM0804 (success) or MEM0805 (failure) in the System Event Log (SEL) for an indication of next
steps.
• Updates to Self-Healing Algorithm – Prior to this update, PowerEdge server BIOS would
rigorously test the target memory location prior to performing self-healing. This would ensure
that self-healing is run only after 100% confirmation of a hard error. However, because of the
abundance of self-healing resources found in genuine Dell DIMMs and the clear benefit self-
healing has to customers, Dell modified the algorithm to extend self-healing to both ‘confirmed’
fail locations and ‘questionable’ fail locations.
• MCA Recovery across all Xeon SP SKUs – Prior to this update, only PowerEdge servers utilizing
Advanced RAS Intel processors could perform MCA Recovery. With this BIOS update, PowerEdge
servers utilizing any Intel Xeon SP processor will have capability to perform the MCA Recovery
feature.
• Improvements to the MEM8000 Event – When a PowerEdge server logs the MEM8000 message
in the System Event Log, it is intended to imply that BIOS has detected a rate of correctable
errors that may impact performance. Starting from BIOS 2.0.3, Dell made an improvement to