HP ProLiant DL388e HP ProLiant DL388e Gen8 Server User Guide - Page 61

Online Spare memory, Lockstep Memory mode, Memory population guidelines

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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. Using HP Advanced Memory Error Detection technology, the server provides notification when a DIMM is degrading and has a higher probability of uncorrectable memory error. Online Spare memory Online Spare memory mode provides protection against degraded DIMMs by reducing the likelihood of uncorrected memory errors. This protection is available without any operating system support. Online Spare memory protection dedicates one rank of each memory channel for use as spare memory. The remaining ranks are available for OS and application use. If correctable memory errors occur at a rate higher than a specific threshold on any of the non-spare ranks, the server automatically copies the memory contents of the degraded rank to the online spare rank. The server then deactivates the failing rank and automatically switches over to the online spare rank. Lockstep Memory mode Lockstep memory mode provides protection against multibit memory errors that occur on the same DRAM device. Lockstep memory 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 memory mode uses channel 1 and channel 2. Channel 3 is not populated. Because channel 3 cannot be populated when using Lockstep memory mode, the maximum memory capacity is lower than Advanced ECC mode. Memory performance with Advanced ECC is also slightly higher. Maximum capacity Type RDIMM RDIMM LRDIMM UDIMM UDIMM Rank Single Dual Quad Single Dual Single processor 48 GB 96 GB 192 GB 12 GB 48 GB Dual processors 96 GB 192 GB 384 GB 24 GB 96 GB For the latest memory configuration information, see the QuickSpecs on the HP website (http://www.hp.com). Memory population guidelines General DIMM slot population guidelines Observe the following guidelines for all AMP modes: • Install DIMMs only if the corresponding processor is installed. • Do not mix LRDIMMs, UDIMMs, or RDIMMs. • White DIMM slots denote the first slot of a channel (1-A, 2-B, 3-C). • When two processors are installed, balance the DIMMs across the two processors. • When two processors are installed, install the DIMMs in sequential alphabetical order balanced between the two processors: P1-A, P2-A, P1-B, P2-B, P1-C, P2-C, and so forth. Hardware options installation 61

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Hardware options installation 61
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. Using HP Advanced
Memory Error Detection technology, the server provides notification when a DIMM is degrading and has a
higher probability of uncorrectable memory error.
Online Spare memory
Online Spare memory mode provides protection against degraded DIMMs by reducing the likelihood of
uncorrected memory errors. This protection is available without any operating system support.
Online Spare memory protection dedicates one rank of each memory channel for use as spare memory. The
remaining ranks are available for OS and application use. If correctable memory errors occur at a rate
higher than a specific threshold on any of the non-spare ranks, the server automatically copies the memory
contents of the degraded rank to the online spare rank. The server then deactivates the failing rank and
automatically switches over to the online spare rank.
Lockstep Memory mode
Lockstep memory mode provides protection against multibit memory errors that occur on the same DRAM
device. Lockstep memory 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 memory mode uses channel 1 and channel 2. Channel 3 is not populated. Because channel 3
cannot be populated when using Lockstep memory mode, the maximum memory capacity is lower than
Advanced ECC mode. Memory performance with Advanced ECC is also slightly higher.
Maximum capacity
Type
Rank
Single processor
Dual processors
RDIMM
Single
48 GB
96 GB
RDIMM
Dual
96 GB
192 GB
LRDIMM
Quad
192 GB
384 GB
UDIMM
Single
12 GB
24 GB
UDIMM
Dual
48 GB
96 GB
For the latest memory configuration information, see the QuickSpecs on the HP website
(
).
Memory population guidelines
General DIMM slot population guidelines
Observe the following guidelines for all AMP modes:
•
Install DIMMs only if the corresponding processor is installed.
•
Do not mix LRDIMMs, UDIMMs, or RDIMMs.
•
White DIMM slots denote the first slot of a channel (1-A, 2-B, 3-C).
•
When two processors are installed, balance the DIMMs across the two processors.
•
When two processors are installed, install the DIMMs in sequential alphabetical order balanced
between the two processors: P1-A, P2-A, P1-B, P2-B, P1-C, P2-C, and so forth.