HP ProLiant ML350 G5 Server - Configuring Memory

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Overview

The HP ProLiant ML350 G5 requires memory interleaving when more than one DIMM is installed. For interleaving, DIMMs must beconfigured in identical pairs.

NOTE: The system will not boot properly if multiple DIMMs of varying density or type are installed in thesystem.

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

Advanced ECC supporting up to 16 GB of active memory using 2 GB FBDIMMs.
Online Spare Memory providing additional protection against degrading FBDIMMs supporting up to14 GB of active memory and 2 GB of online spare memory utilizing 2 GB FBDIMMs.

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.

NOTE: If the configured AMP mode is notsupported by the installed FBDIMM configuration, the system boots in Advanced ECC mode.

The following configuration requirements apply to all AMP modes:

FBDIMMS must be ECC Registered DDR-2 SDRAM FBDIMMs.
FBDIMMs must be installed in pairs.
FBDIMMS must be populated as specified for each AMP memory mode.

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Standard Memory

All HP ProLiant ML350 G5 models ship with PC2-5300 Fully Buffered DIMMs (DDR2-667).
Entry models include a single 512 MB DIMM.
Base models include two 512 MB DIMMs (1 GB total memory).
Factory Integrated Models include the memory capacity of your choice.

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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.

Figure 1: Common Memory Configuration

1 - Slot 1, Bank A
2 - Slot 2, Bank B
3 - Slot 3, Bank C
4 - Slot 4, Bank D
5 - Slot 5, Bank A
6 - Slot 6, Bank B
7 - Slot 7, Bank C
8 - Slot 8, Bank D
9 - Standard 512 MB DIMM

Common Memory Configuration
Memory		Slot
		1A	2B	3C	4D	5A	6B	7C	8D
Standard	1 GB	512 MB	Empty	Empty	Empty	512 MB	Empty	Empty	Empty
Optional	13 GB	512 MB	2 GB	2 GB	2 GB	512 MB	2 GB	2 GB	2 GB
Maximum	16 GB	2 GB	2 GB	2 GB	2 GB	2 GB	2 GB	2 GB	2 GB

NOTE: This chart does not represent all possible memory configurations. For example, 512 MB modules illustrated here for Standard and Optional configuration, can also be put in Bank B(Slot 2 and 7), Bank C(Slot 3 and 7), or Bank D(Slot 4 and 8)

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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:

FBDIMMs must be installed in pairs unless operating in single-FBDIMM mode. The server supportssingle-FBDIMM mode only in FBDIMM slot 1A.
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, unless a singleDIMM is used:

Advanced ECC mode FBDIMM configuration
Configuration	Bank A	Bank B	Bank C	Bank D
Configuration	1A and 5A	2B and 6B	3C and 7C	4D and 8D
1	X	—	—	—
2	X	X	—	—
3	X	X	X	—
4	X	X	X	X

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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.

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

When only bank A is being used, it must be fully populated with dual-rank FBDIMMs.
For optimum memory usage, it is recommended that all FBDIMMs be the same size with the same part number.

NOTE: If different sized FBDIMMs are used, a portion of the installed memory may not be utilized.

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

Online spare FBDIMM configuration
Configuration	Bank A	Bank B	Bank C	Bank D
Configuration	1A and 5A	2B and 6B	3C and 7C	4D and 8D
1	X	—	—	—
2	X	X	—	—
3	X	X	X	—

NOTE:

Configuration 1 (Bank A only) is only supported if using bank A, populated with dual-rank FBDIMMs.
After installing FBDIMMs, use RBSU to configure the system for online spare memory support.

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