Dell PowerEdge R640 - Page 21

Table 8. Supported RAS features
Feature Description
Dense conguration
optimized prole
Increased memory reliability can be a result from this selectable platform prole that adjusts parameters to
reduce faults regarding refresh rates, speed, temperature, and voltage.
Memory demand and
patrol scrubbing
Demand scrubbing is the ability to write corrected data back to the memory once a correctable error is
detected on a read transaction. Patrol scrubbing proactively scans the system memory, detecting and repairing
correctable errors.
Recovery from Single
Device Data Correction
(SDDC)
Single Device Data Correction provides error checking and correction that protects against any single memory
chip failure and multi-bit errors from any portion of a single memory chip.
Failed DIMM isolation This feature helps identify a specic failing DIMM channel pair, enabling the user to replace only the failed
DIMM pair.
Memory mirroring
Memory mirroring is a method of keeping a duplicate (secondary or mirrored) copy of the contents of memory
as a redundant backup for use if the primary intrasocket memory fails. The mirrored copy of the memory is
stored in memory of the same processor socket.
Memory address parity
protection
This feature helps detect transient errors on the address lines of the DDR channel.
Memory sparing—rank Memory sparing allocates one rank per channel as a spare. If excessive correctable errors occur in a rank or
channel, they are moved to the spare area while the operating system is running to prevent the errors from
causing an uncorrectable failure.
Memory thermal
throttling
This feature helps to optimize power/performance and can also be used to prevent DIMMs from overheating.
For information on memory mirroring and sparing congurations, see the Dell EMC PowerEdge R640 Installation and Service Manual at
Dell.com/Support/Manuals.
Memory
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