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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.
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.
For more information about server memory, see the HP website (http://www.hp.com/go/memory).
DIMM speeds are supported as indicated in the following table.
Populated slots
(per channel)
1
2
2
3
Depending on the processor model, the number of DIMMs installed, and whether LRDIMMs or RDIMMs are
installed, the memory clock speed can be reduced to 1600 MT/s.
Advanced ECC population guidelines
For Advanced ECC mode configurations, observe the following guidelines:
•
Observe the general DIMM slot population guidelines (on page 41).
Rank
Single-, dual-, or
quad-rank
Single- or dual-rank
Quad-rank
Single-, dual-, or
quad-rank
Speeds supported (MT/s)
2133
2133
2133
1600
Hardware options installation 41
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