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 - For a description of how the DIMM sparing functionality improves server fault
tolerance, refer to “DIMM Sparing” in SPARC M8 and SPARC M7 Servers Administration
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.
■
SPARC M7-8 and SPARC M7-16 servers: Use all 16-Gbyte, all 32-Gbyte, or all 64-Gbyte
DDR4 DIMMs.
■
Ensure that all DIMMs in a CMIOU are the same size and type. Do not mix 32GB
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
CMIOU have the same capacity.
■
Use only Oracle qualified DIMMs.
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
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