Dell EMC PowerEdge T440 - Memory RAS Features; Table 8. Supported RAS Features

• Can mix DIMMs with dierent capacities:
– Population rules require the largest capacity DIMM be placed rst (slot A1 populated rst, then A2, and so on. The second
CPU mirrors the rst CPU population).
– Maximum of two dierent capacity DIMMs allowed in a system
• Can mix DIMMs with dierent ranks:
– Maximum of two dierent rank DIMMs allowed in a system
For more information on memory conguration and population, see the Dell EMC PowerEdge T440 Installation and Service Manual at
Dell.com/Support/Manuals.
Memory RAS features
Reliability, Availability, and Serviceability (RAS) features help keep the system online and operational without signicant impact to
performance. RAS can decrease data loss and crashing due to errors. RAS helps in rapid, accurate diagnosis of faults that requires
servicing.
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 T440 Installation and Service Manual
at Dell.com/Support/Manuals.
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