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Online Spare memory configuration
Online spare memory provides protection against degraded DIMM s 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.
General DIMM slot population guidelines
Observe the following guidelines for all AMP modes:
•
Install DIMMs only if the corresponding processor is installed.
•
When two processors are installed, balance the DIMMs across the two processors.
•
White DIMM slots denote the first slot of a channel (Ch 1-A, Ch 2-B, Ch 3-C, Ch 4-D)
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Do not mix RDIMMs and LRDIMMs.
•
When 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 alphabetic 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 or three
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.
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.
Population order
For memory configurations with a single processor or multiple processors, DIMMs must be populated
sequentially in alphabetical order (A through H).
After installing the DIMMs, use the BIOS/Platform Configuration (RBSU) in the UEFI System Utilities to
configure supported AMP modes.
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Online Spare memory configuration
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