Page 49 - hp server user guide_Neat

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 that are optimized for the installed processor ("Memory-processor compatibility
information" on page 44).
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 50).
• 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 49).

• 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 49).
• 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.

Hardware options installation 49