Page 23 - Dell PowerEdge R620 Technical Guide

RAS aids in rapid, accurate diagnosis of faults which require service. Table 11 describes the RAS
features supported on the R620.

Feature Description

Dense configuration Increased memory reliability can be a result from this selectable platform profile
optimized profile that adjusts parameters to reduce faults regarding refresh rates, speed,
temperature and voltage

Memory demand and Demand scrubbing is the ability to write corrected data back to the memory once
patrol scrubbing a correctable error is detected on a read transaction.
Patrol scrubbing proactively searches the system memory, repairing correctable
errors.
Recovery from single Recovery from Single DRAM Device Failure (SDDC) provides error checking and
DRAM device failure 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: Memory mirroring is a method of keeping a duplicate (secondary or mirrored)
intra-socket 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 This feature provides the ability to detect transient errors on the address lines of
protection 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 This feature helps to optimize power/performance and can also be used to
throttling prevent DIMMs from overheating.

For information on memory mirroring and sparing configurations, see the Dell PowerEdge R620
Owner’s Manual on Support.Dell.com/Manuals.