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Standard ECC can correct 1-bit memory errors and detects multi-bit memory errors. When standard
ECC detects multi-bit errors, it informs the server and stops the server. Independent mode can
prevent multi-bit errors from occurring on the server, and correct 1-bit or 4-bit memory errors (when
the errors are located on the same DDR4 on the DIMM). Independent mode can provide more
powerful protection and correct memory errors that cannot be corrected by standard ECC and cause
the server to shut down.
Mirror Mode
Mirror mode uses a portion of the system memory for mirroring, to improve system stability and
prevent uncorrectable memory errors that cause server downtime. When an uncorrectable error is
detected in a memory channel, the blade server will fetch data from the mirrored memory. The mirror
mode is a channel-level memory mode, for example, CH2 is the mirror for CH1, CH3 for CH2, and
CH1 for CH3.
Memory Rank Sparing
Use a portion of the system memory rank as backup rank to improve system stability. When this
feature is enabled, if the correctable errors that occur in a non-backup rank exceeds a specific
threshold, the blade server enables the backup rank to replace and disable the failed rank.
DIMM installation guidelines
The blade server supports 1 or 2 CPUs, each CPU supports 8 channels, and each channel supports
2 DIMMs, that is, one CPU supports 16 DIMMs and 2 CPUs support 32 DIMMs. The server supports
DDR4-only configuration and also a mixture of PMem 200 and DDR4.
NOTE:
The operating frequency of the DIMM can be up to 3200 MHz only when both of the following
conditions are met:
•
Use a CPU with a maximum DIMM frequency of 3200 MHz.
•
Use a DIMM with a maximum frequency of 3200 MHz.
•
Only one DIMM is configured in each of the channels where DIMM is configured.
DIMM and CPU compatibility
describes the DIMM and CPU compatibility.
Table 20 DIMM and CPU compatibility
CPU type
CPU-compatible DIMM type
@ frequency
Maximum DIMM capacity supported
by a single CPU (DDR4 and PMem
included)
•
Intel Ice Lake
•
DDR4 @3200 MHz
•
PMem 200 @2666 MHz
6 TB
Montage Jintide C3
series
DDR4 @3200 MHz
6 TB
DIMM operating frequency
