Release Notes

15 Memory Errors and Dell PowerEdge YX4X Server Memory RAS Features
▪ Downside: 25% memory capacity reduction, available for VMware vSphere 5.5
or higher only
o Good – Configure server to operate in Rank Sparing Mode
▪ Benefit: Run-time elimination of memory ranks that are operating in a degraded
state due to a large number of correctable errors
▪ Downside: Varying amount of memory capacity reduction depending on
memory configuration
• Configure server to run memory patrol scrub in ‘Extended Mode’
o Benefit: Patrol scrub will run every four hours (instead of 24); increased frequency will
reduce the accumulation of errors in areas of memory with low utilization and thus not
being corrected by demand scrub
• Configure server with Intel Xeon SP processors with Advanced RAS capabilities (Gold or Platinum
family) or AMD EPYC processors
o Benefit: Enables MCA Recovery to prevent uncorrectable errors in user memory space
from crashing the host
It is also recommended that users keep their PowerEdge server firmware up to date, especially server
BIOS. This is because even after products ship, PowerEdge server development continuously works to
improve its RAS algorithms and behaviors for an optimal customer experience. Users will also benefit
from keeping BIOS up to date by receiving regular maintenance releases to their platform memory
reference code.
FYI: Memory Reference Code (MRC) is a BIOS code that performs memory training,
configuration, and link optimization.
Recommended User Actions When Encountering Memory Errors
The following is a list of the most common memory errors (as reported in the system event log) and the
recommended user response actions:
• MEM0001 – This is an indication that the system has encountered an uncorrectable memory
error at the specified DIMM location in the event message.
o Recommended Response Action: Contact Dell technical support.
• MEM0005 – This is an indication that the system is encountering correctable errors at the
specified DIMM location and would benefit from Dell memory self-healing.
o Recommended Response Action: Reboot the system at the earliest convenience.
PowerEdge server BIOS will initiate the self-healing process automatically (note that
BIOS may initiate more reboots during this process). Do not remove or swap the DIMM
at the specified location in the event message.
• MEM0701 – Same as MEM0005.
• MEM0702 – Same as MEM0005.
• MEM0802 – Same as MEM0005.
• MEM0805 – This is an indication that the system is unable to successfully perform memory self-
healing at the specified DIMM location in the event message.
o Recommended Response Action: Contact Dell technical support.
• MEM9072 – Same as MEM0001.