Dell PowerEdge M420 Technical Manual

Also see for PowerEdge M420: Manual Command reference guide Owner's manual Administrator's guide Information update

Contents

Dell PowerEdge M420 Technical Manual Manual pdf 21 page image

21 PowerEdge M420 Technical GuideTable 9. Memory RAS featuresFeature DescriptionDense configurationoptimized profileIncreased memory reliability can be a result from this selectable platform profilethat adjusts parameters to reduce faults regarding refresh rates, speed,temperature and voltage.Memory demand andpatrol scrubbingDemand scrubbing is the ability to write corrected data back to the memory oncea correctable error is detected on a read transaction. Patrol scrubbing proactivelysearches the system memory, repairing correctable errors.Recovery from singleDRAM device failure(SDDC)Recovery from Single DRAM Device Failure (SDDC) provides error checking andcorrection that protects against any single memory chip failure as well as multi-biterrors from any portion of a single memory chip.Failed DIMM isolation This feature provides the ability to identify a specific failing DIMM channel pair,thereby enabling the user to replace only the failed DIMM pair.Memory mirroring:intra-socketMemory 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 primarymemory fails. The mirrored copy of the memory is stored in memory of the sameprocessor socket.Memory address parityprotectionThis feature provides the ability to detect transient errors on the address lines ofthe DDR channel.Memory sparing (rank)Memory sparing allocates one rank per channel as a spare. If excessive correctableerrors occur in a rank or channel, they are moved to the spare area while theoperating system is running to prevent the errors from causing an uncorrectablefailure.Memory thermalthrottlingThis feature helps to optimize power and performance, and it can also be used toprevent DIMMs from overheating.For information on memory mirroring and sparing configurations, see theDell PowerEdge M420Systems Owner’s Manual on Dell.com/Support/Manuals. Memory RAID is not supported.