Hardware options installation 66
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 compatible with the installed processor.
• 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 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 DIMM spare replacement, install the DIMMs per slot number as instructed by the system
software.
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.
• 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.
• Each channel must have a valid online spare configuration.
• Each channel can have a different valid online spare configuration.
• Each populated channel must have a spare rank. A single dual-rank DIMM is not a valid
configuration.
Mirrored Memory population guidelines
For Mirrored Memory mode configurations, observe the following guidelines:
• Observe the general DIMM slot population guidelines.
• Install DIMMs in either channel 1 and channel 2, or channel 3 and channel 4. Installed DIMMs must
be identical in terms of size and organization.
• In multi-processor configurations, each processor must have a valid Mirrored Memory configuration.
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