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Advanced Memory Protection options are configured in the BIOS/Platform Configuration (RBSU). If the
requested AMP mode is not supported by the installed DIMM configuration, the server blade boots in
Advanced ECC mode. For more information, see the HPE UEFI System Utilities User Guide for HPE
ProLiant Gen9 Servers on the Hewlett Packard Enterprise website
(http://www.hpe.com/info/ProLiantUEFI/docs).
Advanced ECC memory configuration
Advanced ECC memory is the default memory protection mode for this server blade. Standard ECC can
correct single-bit memory errors and detect multi-bit memory errors. When multi-bit errors are detected
using Standard ECC, the error is signaled to the server blade and causes the server blade to halt.
Advanced ECC protects the server blade against some multi-bit memory errors. Advanced ECC can
correct both single-bit memory errors and 4-bit memory errors if all failed bits are on the same DRAM
device on the DIMM.
Advanced ECC provides additional protection over Standard ECC because it is possible to correct certain
memory errors that would otherwise be uncorrected and result in a server blade failure. Using HPE
Advanced Memory Error Detection technology, the server blade provides notification when a DIMM is
degrading and has a higher probability of uncorrectable memory error.
Online Spare memory configuration
Online spare memory provides protection against degraded DIMMs by reducing the likelihood of
uncorrected memory errors. This protection is available without any operating system support.
Online spare memory protection dedicates one rank of each memory channel for use as spare memory.
The remaining ranks are available for OS and application use. If correctable memory errors occur at a rate
higher than a specific threshold on any of the non-spare ranks, the server blade automatically copies the
memory contents of the degraded rank to the online spare rank. The server blade then deactivates the
failing rank and automatically switches over to the online spare rank.
Mirrored memory configuration
Mirroring provides protection against uncorrected memory errors that would otherwise result in server
blade downtime. Mirroring is performed at the channel level to one memory channel pair that can be
either:
•
Channel 1 data being mirrored in channel 2
•
Channel 3 data being mirrored in channel 4
If an uncorrectable error is detected in the active memory channel, data is retrieved from the mirror
channel. This channel becomes the new active channel, and the system disables the channel with the
failed DIMM.
General DIMM slot population guidelines
Observe the following guidelines for all AMP modes:
•
Install DIMMs that are optimized for the installed processor.
To identify the processor type installed in the server blade, use the BIOS/Platform Configuration
(RBSU) of the UEFI System Utilities
•
Install DIMMs only if the corresponding processor is installed.
•
Do not mix LRDIMMs and RDIMMs.
•
White DIMM slots denote the first slot of a channel (Ch 1-A, Ch 2-B, Ch 3-C, Ch 4-D).
•
When only one processor is installed, install DIMMs in sequential alphabetic order: A, B, C, D, E, F,
and so forth.
("Identifying the processor
type" on page 48).
Hardware options installation 47
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