Dell PowerEdge 2450 Specifications download pdf (Page 20)

20 PowerEdge M520 Technical Guide

Table 9. Memory RAS features

Feature

Description

Dense configuration

optimized profile

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.

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

searches the system memory, repairing correctable errors.

Recovery from single

DRAM device failure

(SDDC)

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.

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-socket

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.

Memory address parity

protection

This feature provides the ability to 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 configurations, see the

Dell PowerEdge M520

Systems Owner’s Manual

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

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