Dell PowerEdge R810 Specifications download pdf (Page 20)

20 PowerEdge R820 Technical Guide

Reliability, availability, 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 that require service. Table 11 describes the RAS

features supported on the R820.

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

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, it is moved to the spare area while the operating

system is running to prevent the error 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 R820

Systems Owner’s Manual

on Support.Dell.com/Manuals.

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