Hp ProLiant DL360 G5 Server Bedienungsanleitung PDF herunterladen (Seite 38)

Hardware options installation 38

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FBDIMM pairs in a memory bank must have identical HP part numbers.

• FBDIMMS must be populated as specified for each AMP memory mode.

The memory subsystem for this server is divided into two branches. Each memory branch is essentially a

separate memory controller. The FBDIMMs map to the two branches as indicated in the following table:

Branch 0 Branch 1

FBDIMM 1A FBDIMM 5B

FBDIMM 3A FBDIMM 7B

FBDIMM 2C FBDIMM 6D

FBDIMM 4C FBDIMM 8D

This multi-branch architecture provides enhanced performance in Advanced ECC mode. The concept of

multiple branches is important for the operation of online spare mode and mirrored memory mode.

If the server contains more than 4 GB of memory, consult the operating system documentation about

accessing the full amount of installed memory.

Advanced ECC memory

Advanced ECC memory is the default memory protection mode for this server. In Advanced ECC, the

server is protected against correctable memory errors. The server provides notification if the level of

correctable errors exceeds a pre-defined threshold rate. The server does not fail because of correctable

memory errors. Advanced ECC provides additional protection over Standard ECC because it is possible

to correct certain memory errors that would otherwise be uncorrectable and result in a server failure.

Whereas standard ECC can correct single-bit memory errors, Advanced ECC can correct single-bit

memory errors and multi-bit memory errors if all failed bits are on the same DRAM device on the

FBDIMM.

In addition to general configuration requirements, Advanced ECC memory also has the following

configuration requirements:

• FBDIMMs must be installed in pairs.

• FBDIMMs must be installed in sequential order, beginning with bank A.

In Advanced ECC mode, FBDIMMs must be populated as specified in the following table:

Configuration Bank A

1A and 3A

Bank B

5B and 7B

Bank C

2C and 4C

Bank D

6D and 8D

1 X — — —

2 X X — —

3 X X X —

4 X X X X

Online spare memory configuration

Online spare memory provides protection against degrading FBDIMMs by reducing the likelihood of

uncorrectable memory errors. This protection is available without any operating system support.

An understanding of single-rank and dual-rank FBDIMMs is required to understand memory usage in

online spare mode. FBDIMMs can either be single-rank or dual-rank. Certain FBDIMM configuration

requirements are based on these classifications. A dual-rank FBDIMM is similar to having two single-rank

FBDIMMs on the same module. Although only a single FBDIMM module, a dual-rank FBDIMM acts as two

separate FBDIMMs. The purpose of dual-rank FBDIMMs is to provide the largest capacity FBDIMM for the

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