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Rdimm maximum memory configurations, Udimm maximum memory configurations, Advanced ecc memory configuration – HP PROLIANT 580554-001 User Manual

Page 25: Mirrored memory configuration, General dimm slot population guidelines

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Hardware options installation 25

Advanced Memory Protection options are configured in RBSU. If the requested AMP mode is not

supported by the installed DIMM configuration, the server blade boots in Advanced ECC mode. For more
information, see "HP ROM-Based Setup Utility (on page 37)."
For the latest memory configuration information, see the QuickSpecs on the HP website

(http://www.hp.com).

RDIMM maximum memory configurations

The following table lists the maximum memory configuration possible with 16-GB RDIMMs.

Rank Maximum

memory

configuration

Single-rank 96

GB

Dual-rank 96

GB

Quad-rank 64

GB

UDIMM maximum memory configurations

The server blade supports a maximum memory configuration of 12 GB using 2-GB single- or dual-rank

UDIMMs.

Advanced ECC memory configuration

Advanced ECC memory is the default memory protection mode for this server blade. 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 server blade and causes the server blade to halt.
Advanced ECC protects the server blade 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 server blade failure. The server blade

provides notification that correctable error events have exceeded a pre-defined threshold rate.

Mirrored memory configuration

Mirroring provides protection against uncorrected memory errors that would otherwise result in server
blade downtime. Mirroring is performed at the channel level. Channels 1 and 2 are used; channel 3 is

not populated.
Data is written to both memory channels. Data is read from one of the two memory channels. 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:

Always populate channels 1 and 2 for both processors.

To maximize performance, distribute the total memory capacity between both processors in a server
as evenly as possible.