Dimm Configuration - Oracle SPARC M8 Service Manual

DIMM Configuration

DIMM Configuration
Full-population and half-population configurations are supported. The figure shows a CMIOU
with all of the DIMM slots populated with DIMMs. In a half-populated configuration, DIMMs
are installed only in the slots displayed in black.
Note -
tolerance, refer to
Guide.
Follow these guidelines when replacing DIMMs in a CMIOU:
SPARC M8-8 servers: Use either all 32-Gbyte or all 64-Gbyte DDR4 DIMMs.
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SPARC M7-8 and SPARC M7-16 servers: Use all 16-Gbyte, all 32-Gbyte, or all 64-Gbyte
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DDR4 DIMMs.
Ensure that all DIMMs in a CMIOU are the same size and type. Do not mix 32GB
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LRDIMMs (4R x 4Gb) and 32 GB RDIMMs (2R x 8Gb) in the same CMIOU.
If you are using DIMMs of different capacities in the same host, ensure that all DIMMs in a
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CMIOU have the same capacity.
Use only Oracle qualified DIMMs.
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The SPARC M8 CMIOU DIMM locations and the buffer chip (BOB) and DDR channel (CH)
numbers are as follows:
106 SPARC M8 and SPARC M7 Servers Service Manual • September 2017
For a description of how the DIMM sparing functionality improves server fault
"DIMM Sparing" in SPARC M8 and SPARC M7 Servers Administration