Hardware options installation 102
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.
Mirrored memory configuration
Mirroring provides protection against uncorrected memory errors that would otherwise result in server
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 ("Memory-processor compatibility
information" on page 97).
To identify the processor type installed in the server, use the BIOS/Platform Configuration (RBSU) of
the UEFI System Utilities ("Identifying the processor type" on page 103).
• 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.
• When two processors are installed, install the DIMMs in sequential alphabetical order balanced
between the two processors: P1-A, P2-A, P1-B, P2-B, P1-C, P2-C, and so forth.
• When single-rank, dual-rank, and quad-rank DIMMs are populated for two DIMMs per channel,
always populate the higher number rank DIMM first (starting from the farthest slot). For example, first
quad-rank DIMM, then dual-rank DIMM, and then lastly single-rank DIMM.
• DIMMs should be populated starting farthest from the processor on each channel.
For more information about server memory, see the Hewlett Packard Enterprise website
(http://www.hpe.com/info/memory).
Advanced ECC population guidelines
For Advanced ECC mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 102).
• DIMMs may be installed individually.
Online spare population guidelines
For Online Spare memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines (on page 102).
• Each channel must have a valid online spare configuration.
• Each channel can have a different valid online spare configuration.
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