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DIMM type
RDIMM
RDIMM
LRDIMM
LRDIMM
LRDIMM
For the latest memory configuration information, see the QuickSpecs on the Hewlett Packard Enterprise
website (http://www.hpe.com/info/qs).
Advanced ECC memory configuration
Advanced ECC memory is the default memory protection mode for this compute module. 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 compute module and causes the compute module to halt.
Advanced ECC protects the compute module 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 compute module failure. Using HPE
Advanced Memory Error Detection technology, the compute module 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 compute module automatically copies the
memory contents of the degraded rank to the online spare rank. The compute module 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)
•
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.
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Advanced ECC memory configuration
DIMM rank
Capacity (GB)
Dual
16
Dual
32
Dual
32
Quad
64
Octal
128
One processor
Two processors
(GB)
(GB)
192
384
384
768
384
768
768
1536
1536
3072
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Troubleshooting
