Hp ML100 User Manual download pdf (Page 26)

• Lockstep—provides enhanced protection while making all installed memory available to the

operating system. The server can continue to function if a single- or mulit-bit memory failure within a

single DRAM device occurs.

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

supported by the installed DIMM configuration, the server boots in Advanced ECC mode. For more

information, see "

HP ROM-Based Setup Utility ("ROM-Based Setup Utility" on page 38)."

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 4-GB RDIMMs.

Rank Single-processor Dual-processor

Single-rank 24 GB 48 GB

Dual-rank 24 GB 48 GB

Quad-rank 24 GB 48 GB

UDIMM maximum memory configurations

The server supports a maximum of 12 GB with one processor and 24 GB with two processors using 2-GB

single- or dual-rank UDIMMs.

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.

General DIMM slot population guidelines

Observe the following guidelines for all AMP modes:

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Hp ML100 User Manual Page 26