Dell PowerEdge M620 Техническое руководство - Страница 19

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Dell PowerEdge M620 Техническое руководство

DIMM

DIMM 0

type

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 M620.

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 M620 Technical Guide

DIMM 1

DIMM 2

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.

# of

DIMMs

800

1066

∞

Speed (MT/s)

1333

1600

∞

Dell PowerEdge M620