Memory Configurations; Advanced Ecc Memory Configuration; Online Spare Memory Configuration - HP Apollo 4200 Gen9 User Manual

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For more information about product features, specifications, options, configurations, and compatibility, see the
product QuickSpecs on the Hewlett Packard Enterprise website.

Memory configurations

To optimize server availability, the server supports the following AMP modes:
• Advanced ECC—Provides up to 4-bit error correction. This mode is the default option for this server.
• Online spare memory—Provides protection against failing or degraded DIMMs. Certain memory is
reserved as spare, and automatic failover to spare memory occurs when the system detects a DIMM that
is degrading. This allows DIMMs that have a higher probability of receiving an uncorrectable memory error
(which would result in system downtime) to be removed from operation.
• Mirrored memory—Provides maximum protection against failed DIMMs. Uncorrectable errors in one
channel are corrected by the mirror channel.
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 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.

Advanced ECC memory configuration

Advanced ECC memory is the default memory protection mode for this server. 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 and causes the server to halt.
Advanced ECC protects the server 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 failure. Using HPE Advanced
Memory Error Detection technology, the server 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 automatically copies the memory contents
of the degraded rank to the online spare rank. The server then deactivates the failing rank and automatically
switches over to the online spare rank.
124 Memory configurations
Description
Maximum memory speed
CAS latency
DIMM type
Definition
2133 MT/s
2400 MT/s
P=15
T=17
R = RDIMM (registered)
L = LRDIMM (load reduced)