HP 828689-002, Руководство пользователя

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Hardware options installation 25
Item Description Definition
2
Rank 1R = Single-rank
2R = Dual-rank
4R = Quad-rank
3
Data width on DRAM x4 = 4-bit
x8 = 8-bit
4
Memory generation DDR4
5
Maximum memory speed 2133 MT/s
2400 MT/s
6
CAS latency P=15
T=17
7
DIMM type R = RDIMM (registered)
L = LRDIMM (load reduced)
For more information about product features, specifications, options, configurations, and compatibility,
see the product QuickSpecs on the Hewlett Packard Enterprise website ( http://www.hpe.com/info/qs ).
Memory configurations
To optimize server availability, the server supports the following AMP modes:
Advanced ECC
Provides up to 4-bit error correction and enhanced performance over Lockstep mode. This mode is the
default option for this server.
Online spare memory
Online spare memory 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.
Mirrored memory
Errors that are not corrected by ECC or SDDC cannot be corrected by Online spare memory. Mirrored
memory provides the greatest protection against memory failure beyond ECC, SDDC, and Online spare
memory by providing added redundancy in the memory sub-system. Upon detecting an uncorrectable
memory error from a DIMM in a memory cartridge, the processor avoids a system crash by reading the
mirrored DIMM. In this case, the system management routine disables the failed DIMM. Further memory
reads and writes will only occur on the mirrored DIMM.
Limitations to Mirrored Memory mode are as follows:
•
In Mirrored Memory mode, half of the memory is allocated to memory protection.
•
The available memory bandwidth is reduced by up to 50% in this mode.
•
Mirrored Memory, Online Spare mode cannot be enabled simultaneously.
Advanced Memory Protection options are configured in the BIOS/Platform Configuration (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 the HPE UEFI System Utilities User Guide for ProLiant Gen9
Servers on the Hewlett Packard Enterprise website (
http://www.hpe.com/info/ProLiantUEFI/docs
).
Maximum capacity