Mirrored Memory Configuration; General Dimm Slot Population Guidelines; Advanced Ecc Population Guidelines; Online Spare Population Guidelines - HP Apollo 4200 Gen9 User Manual

Mirrored memory configuration

Mirroring provides protection against uncorrected memory errors that would otherwise result in server
downtime. Mirroring is performed at the channel level to one memory channel pair that can be either:
• Channel 1 data being mirrored in channel 2
• Channel 3 data being mirrored in channel 4
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 optimized for the installed processor.
To identify the processor type installed in the server, use the BIOS/Platform Configuration (RBSU)
of the UEFI System Utilities .
• Install DIMMs only if the corresponding processor is installed.
• Do not mix LRDIMMs and RDIMMs.
• When only one processor is installed, install DIMMs in sequential alphabetic order: Ch 1-A, Ch 2-B, Ch 3-
C, Ch 4-D.
• 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, P1-D, P2-D.
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.

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.

Identifying the processor type

The processor type installed in the server is briefly displayed during POST. To view this information and
additional processor specifications, do the following:
Procedure
1. Reboot the server.
Mirrored memory configuration 125