HP ProLiant DL980 DL980 G7 User Installation Guide - Page 46

Advanced ECC memory population guidelines, with these additional constraints

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AMP modes 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 (on page 73)." For the latest memory configuration information, see the QuickSpecs on the HP website (http://www.hp.com/go/ProLiant). Advanced ECC memory population guidelines Advanced ECC memory is the default memory protection mode for the server. Up to 2-TB of active memory using 16-GB DIMMs is supported in this AMP mode. Advanced ECC can correct single-bit and multi-bit memory errors on a single x8 or two adjacent x4 DRAM devices. The server provides notification when correctable error events have exceeded a pre-defined threshold rate. When uncorrectable errors are detected using Advanced ECC, the server notifies the user and shuts down the operating system. Online Spare memory population guidelines Online spare memory provides protection against persistent DRAM failure. It monitors DIMMs for excessive correctable errors and copies the content of an unhealthy rank to an available spare rank in advance of multi-bit or persistent single-bit failures that may result in uncorrectable faults. Rank-sparing is more efficient than DIMM-sparing since only a portion of a DIMM is set aside for memory protection. When Online Spare memory is enabled, the first ranks of DIMM pair, 1A/8A, are set aside as the sparing ranks. Therefore, the available memory is reduced by the size of the first ranks of DIMM pair 1A/8A. If a DIMM rank on either of the SMI buses exceeds its correctable ECC threshold, then the contents of the failing DIMM ranks are copied to the spare DIMM ranks. Once the copy is complete, all memory accesses to the previous failing DIMM ranks go to the spare DIMM ranks. No performance penalty occurs for rank-sparing, other than the time it takes to copy the data from the failing rank to the spare rank upon an error condition. The following population rules apply to each memory cartridge. Begin with the DIMM installation guidelines (on page 42) with these additional constraints: • All installed processors must contain a valid sparing configuration. • If installing mixed rank DIMMs in a cartridge, follow the mixed rank installation rules of the DIMM installation guidelines (on page 42). • Rank sparing requires that the spare ranks of the DIMM pair 1A/8A be at least as large as any other DIMM rank on the DDR3 channels of the cartridge. To determine the size of a single rank in a DIMM, divide the total DIMM size by the number of ranks. For example, the rank size of a dual-rank 2-GB DIMM is 1 GB and the rank size of a dual-rank 4-GB DIMM is 2 GB. Therefore, it is possible to support rank sparing with mixed DIMM pair sizes in the cartridge if the 1A/8A pair is populated with the 4-GB DIMMs and the other pairs are populated with either the identical 4-GB or 2-GB DIMMs (pairs C and D are not required to be populated). In this case, the 2-GB rank size of the 4-GB DIMMs in the 1A/8A pair is equal to or greater than the rank size of the other installed DIMMs. Hardware options installation 46

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Hardware options installation 46
AMP modes 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 (on page
73
)."
For the latest memory configuration information, see the QuickSpecs on the HP website
(
).
Advanced ECC memory population guidelines
Advanced ECC memory is the default memory protection mode for the server. Up to 2-TB of active
memory using 16-GB DIMMs is supported in this AMP mode.
Advanced ECC can correct single-bit and multi-bit memory errors on a single x8 or two adjacent x4
DRAM devices.
The server provides notification when correctable error events have exceeded a pre-defined threshold
rate. When uncorrectable errors are detected using Advanced ECC, the server notifies the user and shuts
down the operating system.
Online Spare memory population guidelines
Online spare memory provides protection against persistent DRAM failure. It monitors DIMMs for
excessive correctable errors and copies the content of an unhealthy rank to an available spare rank in
advance of multi-bit or persistent single-bit failures that may result in uncorrectable faults. Rank-sparing is
more efficient than DIMM-sparing since only a portion of a DIMM is set aside for memory protection.
When Online Spare memory is enabled, the first ranks of DIMM pair, 1A/8A, are set aside as the
sparing ranks. Therefore, the available memory is reduced by the size of the first ranks of DIMM pair
1A/8A.
If a DIMM rank on either of the SMI buses exceeds its correctable ECC threshold, then the contents of the
failing DIMM ranks are copied to the spare DIMM ranks. Once the copy is complete, all memory
accesses to the previous failing DIMM ranks go to the spare DIMM ranks.
No performance penalty occurs for rank-sparing, other than the time it takes to copy the data from the
failing rank to the spare rank upon an error condition.
The following population rules apply to each memory cartridge. Begin with the DIMM installation
guidelines (on page
42
) with these additional constraints:
•
All installed processors must contain a valid sparing configuration.
•
If installing mixed rank DIMMs in a cartridge, follow the mixed rank installation rules of the DIMM
installation guidelines (on page
42
).
•
Rank sparing requires that the spare ranks of the DIMM pair 1A/8A be at least as large as any
other DIMM rank on the DDR3 channels of the cartridge. To determine the size of a single rank in a
DIMM, divide the total DIMM size by the number of ranks.
For example, the rank size of a dual-rank 2-GB DIMM is 1 GB and the rank size of a dual-rank 4-GB
DIMM is 2 GB. Therefore, it is possible to support rank sparing with mixed DIMM pair sizes in the
cartridge if the 1A/8A pair is populated with the 4-GB DIMMs and the other pairs are populated
with either the identical 4-GB or 2-GB DIMMs (pairs C and D are not required to be populated). In
this case, the 2-GB rank size of the 4-GB DIMMs in the 1A/8A pair is equal to or greater than the
rank size of the other installed DIMMs.