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Rdimm maximum memory configurations, Udimm maximum memory configurations, Advanced ecc memory configuration – HP ProLiant ML370 G6 Server User Manual

Page 49: Lockstep memory configuration, Online spare memory configuration

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Hardware options installation 49

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 configurations possible with 16-GB RDIMMs.

Rank

Single-processor

Dual-processor

Single-rank

36 GB

72 GB

Dual-rank

72 GB

144 GB

Quad-rank

96 GB

192 GB

UDIMM maximum memory configurations

When using 2-GB single- or dual-rank UDIMMs, the server supports a maximum of 24 GB with one processor

and 48 GB with two processors.

Advanced ECC memory configuration

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

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

Lockstep memory configuration

Lockstep mode provides protection against multi-bit memory errors that occur on the same DRAM device.
Lockstep mode can correct any single DRAM device failure on x4 and x8 DIMM types. The DIMMs in each

channel must have identical HP part numbers.
Lockstep mode uses channel 1 and channel 2. Channel 3 is not populated. Because channel 3 cannot be

populated when using Lockstep mode, the maximum memory capacity is lower than Advanced ECC mode.

Memory performance with Advanced ECC is also slightly higher.

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.

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