Dell PowerEdge M420 Manuel technique - Page 20

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Table 8 lists the memory configuration and performance details for the M420, based on the

population of the number and type of DIMMs per memory channel.

DIMM

type

UDIMM

RDIMM

*Although the M420 supports DIMM speeds of 800MT/s and 1066MT/s, you can only purchase

this system with DIMM speeds of 1333MT/s and 1600MT/s on Dell.com.

Reliability, availability, and serviceability (RAS) features help keep the system online and operational

without significant impact to performance, and can decrease data loss and crashing due to errors.

RAS aids in rapid, accurate diagnosis of faults which require service. Table 9 describes the memory

RAS features supported on the M420.

Feature

Dense configuration

optimized profile

Memory demand and

patrol scrubbing

Recovery from single

DRAM device failure

(SDDC)

Failed DIMM isolation

Memory mirroring:

intra-socket

Memory address parity

protection

Memory sparing (rank)

Memory thermal

throttling

For information on memory mirroring and sparing configurations, see the

Systems Owner's Manual

PowerEdge M420 Technical Guide

# of

DIMM 0

DIMMs

Description

Increased memory reliability can be a result from this selectable platform profile

that adjusts parameters to reduce faults regarding refresh rates, speed,

temperature and voltage.

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

searches the system memory, repairing correctable errors.

Recovery from Single DRAM Device Failure (SDDC) provides error checking and

correction that protects against any single memory chip failure as well as multi-bit

errors from any portion of a single memory chip.

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 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

memory fails. The mirrored copy of the memory is stored in memory of the same

processor socket.

This feature provides the ability to detect transient errors on the address lines of

the DDR channel.

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.

This feature helps to optimize power/performance and can also be used to

prevent DIMMs from overheating.

on Support.Dell.com/Manuals. Memory RAID is not supported.

Speed (MT/s)

800*

1066*

1333

∞

1600

∞

Dell PowerEdge M420