Omgfield

Overview

The server supports the following Advanced Memory Protection (AMP) options to optimize serveravailability.

Maximum memory capacities for all AMP modes will increase with the availability of 4 GB and 8 GBFBDIMMs, including a maximum of 64 GB in Advanced ECC mode.

The Advanced Memory Protection option is configured in RBSU. By default, the server is set to AdvancedECC mode. Click here for more information on RBSU.Or refer to the HP ROM-Based Setup Utility User Guide on the DocumentationCD.

The following configuration requirements apply to all AMP modes:

Standard Memory

Common Memory Configuration

Valid DIMM pair combinations use slots 1/5(Bank A), slots 2/6(Bank B), slots 3/7(Bank C), and slots 4/8(Bank D). Maximum supported memory is 16 GB.

Advanced ECC memory

Advanced ECC memory is the default memory protection mode for this server. In Advanced ECC, theserver is protected against correctable memory errors. The server provides notification if the level ofcorrectable errors exceeds a pre-defined threshold rate. The server does not fail because of correctablememory errors. Advanced ECC provides additional protection over Standard ECC because it is possibleto 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-bitmemory errors and multi-bit memory errors if all failed bits are on the same DRAM device on theFBDIMM.

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

In Advanced ECC mode, FBDIMMs must be populated as specified in the following table, unless a singleDIMM is used:

Online spare memory configuration

Online spare memory provides protection against degrading FBDIMMs by reducing the likelihood ofuncorrectable memory errors.

FBDIMMs can either be single-rank or dual-rank. Certain FBDIMM configuration requirements are based on these classifications. Adual-rank FBDIMM is similar to having two separate FBDIMMs, or ranks, on the same module. Although only a single FBDIMMmodule, a dual-rank FBDIMM acts as two separate FBDIMMs. If the current DRAM technology allows for 2 GB single-rankFBDIMMs, a dual-rank FBDIMM using the same technology would be 4 GB.

In online spare mode, a single rank of memory acts as the spare memory. For single-rank FBDIMMs, the entire FBDIMM acts as thespare memory. For a dual-rank FBDIMM, only half of the FBDIMM acts as the spare memory while the other half is available foroperating system and application usage.

If one of the non-spare FBDIMMs receives correctable memory errors at a higher rate than a specificthreshold, the server automatically copies the memory contents of the degraded rank to the online sparerank. The server then deactivates the failing rank and automatically switches over to the online spare.Because FBDIMMs that experience a high rate of correctable memory errors have a higher probability ofreceiving an uncorrectable memory error, this effectively reduces the likelihood of uncorrectable memoryerrors that would result in server downtime.

In online spare mode, FBDIMMs must be populated as specified in the following table:

Overview

The DL360 G5 Server supports Fully Buffered DIMMs (FBDIMMs). The server supports up to 64 GB of memory using 8GB memory modules. Four banks of memory are supported by (8) slots of PC2-5300 FBDIMMs (DDR2-667).

Standard Memory

HP ProLiant DL360 G5 Entry and Base Models

HP ProLiant DL360 G5 Performance Models

Upgrading Memory and Memory Interleaving

Following guidelines must be observed while upgrading memory and memory interleaving:

Standard Memory Plus Optional Memory

HP ProLiant DL360 G5 Entry and Base Models

HP ProLiant DL360 G5 Performance Models

Standard Memory Replaced with Optional Memory

Up to 64 GB of memory is available with the removal of the standard 512 MB or 1 GB of memory and the optional installation of PC2-5300Fully Buffered (DDR2-667) DIMM 8 GB memory kits.

BIOS Memory Configurations

Maximum memory capacities for all AMP modes will increase with the availability of 4-GB and 8-GBFBDIMMs, including a maximum of 64 GB in Advanced ECC mode. For the latest memory configurationinformation, refer to the QuickSpecs on the HP website.

The Advanced Memory Protection option is configured in ROM Based Setup Utility (RBSU). By default, the server is set to AdvancedECC mode. For more information, refer to HP ROM-Based Setup Utility information on page 68 of the Proliant DL360 G5 User Guide.

The memory subsystem for this server is divided into two branches. Each memory branch is essentially aseparate memory controller. The FBDIMMs map to the two branches as indicated in the following table:

This multi-branch architecture provides enhanced performance in Advanced ECC mode. The concept ofmultiple 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 aboutaccessing the full amount of installed memory.

Advanced ECC memory configuration requirements

Advanced ECC memory is the default memory protection mode for this server. In Advanced ECC, theserver is protected against correctable memory errors. The server provides notification if the level ofcorrectable errors exceeds a pre-defined threshold rate. The server does not fail because of correctablememory errors. Advanced ECC provides additional protection over Standard ECC because it is possibleto correct certain memory errors that would otherwise be uncorrectable and result in a server failure.

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

Online spare FBDIMM configuration requirements

Online spare memory provides protection against degrading FBDIMMs by reducing the likelihood ofuncorrectable 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 inonline spare mode. FBDIMMs can either be single-rank or dual-rank. Certain FBDIMM configurationrequirements are based on these classifications. A dual-rank FBDIMM is similar to having two single-rankFBDIMMs on the same module. Although only a single FBDIMM module, a dual-rank FBDIMM acts as twoseparate FBDIMMs. The purpose of dual-rank FBDIMMs is to provide the largest capacity FBDIMM for the current DRAM technology. If the current DRAM technology allows for 2-GB single-rank FBDIMMs, a dualrankFBDIMM using the same technology would be 4-GB.

In online spare mode, a single rank of memory acts as the spare memory. For single-rank FBDIMMs, theentire FBDIMM acts as the spare memory. For a dual-rank FBDIMM, only half of the FBDIMM acts as thespare memory while the other half is available for operating system and application usage.

If one of the non-spare FBDIMMs receives correctable memory errors at a higher rate than a specificthreshold, the server automatically copies the memory contents of the degraded rank to the online sparerank. The server then deactivates the failing rank and automatically switches over to the online spare.Because FBDIMMs that experience a high rate of correctable memory errors also have a higherprobability of receiving an uncorrectable memory error, this configuration reduces the likelihood ofuncorrectable memory errors that would result in server downtime.

Online spare is performed per branch of the memory controller. For a server with both branchespopulated, two ranks are used for online spare memory. One branch can fail over to the associatedonline spare while the other branch is still protected.

Online spare FBDIMM configuration requirements (in addition to general configuration requirements)

In online spare mode, FBDIMMs must be populated as specified in the following table:

Mirrored memory FBDIMM configuration requirements

Mirroring provides protection against uncorrectable memory errors that would otherwise result in serverdowntime.Mirroring is performed on the branch level. Branch 0 and branch 1 mirror each other.

Each branch maintains a copy of all memory contents. Memory writes go to both branches. Memoryreads come from only one of the two branches (unless an uncorrectable error occurs). If a memory readon one branch returns incorrect data due to an uncorrectable memory error, the system automaticallyretrieves the proper data from the other branch. A branch is not necessarily disabled (thus losingmirroring protection) because of a single uncorrectable error. Mirroring protection is not lost because oftransient and soft uncorrectable errors, resulting in systems that maintain mirroring protection (and thusimproved uptime) unless there is a failure of both branches.

Mirrored memory FBDIMMs configuration requirements (in addition to general configuration requirements)

When using mirrored memory mode, FBDIMMs must be populated as specified in the following table: