Table 25. Independent mode with one processor (continued)
16
DIMMs
Note
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Note: DIMM configurations that support Software Guard Extensions (SGX). See
“Enable Software Guard
Extensions (SGX)” on page 294
to enable this feature.
The following table shows the sequence of populating memory modules for independent mode when two
processors (processor 1 and processor 2) are installed.
Table 26. Independent mode with two processors
Total
DIMMs
Processor 1
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
16
DIMMs
Note
16 14 12 10 7 5 3 1
32
DIMMs
Note
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Total
DIMMs
Processor 2
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
16
DIMMs
Note
32 30 28 26 23 21 19 17
32
DIMMs
Note
32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17
Note: DIMM configurations that support Software Guard Extensions (SGX). See
“Enable Software Guard
Extensions (SGX)” on page 294
to enable this feature.
Mirroring mode installation order
Mirroring mode provides full memory redundancy while reducing the total system memory capacity in half.
Memory channels are grouped in pairs with each channel receiving the same data. If a failure occurs, the
memory controller switches from the DIMMs on the primary channel to the DIMMs on the backup channel.
The DIMM installation order for memory mirroring varies based on the number of processors and DIMMs
installed in the server.
In mirroring mode, each memory module in a pair must be identical in size and architecture. The channels are
grouped in pairs with each channel receiving the same data. One channel is used as a backup of the other,
which provides redundancy.
Follow the rules below when installing memory modules in mirroring mode:
• All memory modules to be installed must be of the same Lenovo part number.
• Mirroring can be configured across channels in the same iMC, and the total TruDDR5 memory size of the
primary and secondary channels must be the same.
• Partial Memory Mirroring is a sub-function of memory mirroring. It requires to follow the memory
population for memory mirroring.
The following table shows the memory module population sequence for mirroring mode when only one
processor (processor 1) is installed.
64
ThinkSystem SR630 V4 User Guide
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