Mirroring mode
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.
Partial memory mirroring is a sub-function of memory mirroring, which requires to follow the installation rules of mirroring mode.
All memory modules to be installed must be the same type with the same capacity, frequency, voltage, and ranks.
All Performance+ DIMMs in the server must be of the same type, rank, and capacity (the same Lenovo part number) to operate at 2933 MHz in the configurations with two DIMMs per channel. Performance+ DIMMs cannot be mixed with other DIMMs.
The following table shows the memory module population sequence for mirroring mode when only one processor (Processor 1) is installed.
| Total | Processor 1 | Total | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DIMMs | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | DIMMs | |
| 2 | 5 | 3 | 2 | |||||||||||
| 3 | 5 | 3 | 1 | 3 | ||||||||||
| 4 | 10 | 8 | 5 | 3 | 4 | |||||||||
| 6 | 12 | 10 | 8 | 5 | 3 | 1 | 6 | |||||||
| 8 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 8 | |||||
| 9 | 12 | 10 | 8 | 6 | 5 | 4 | 3 | 2 | 1 | 9 | ||||
| 12 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 12 | |
The following table shows the memory module population sequence for mirroring mode when two processors (Processor 1 and Processor 2) are installed.
| Total | Processor 2 | Processor 1 | Total | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DIMMs | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | DIMMs | |||
| 4 | 17 | 15 | 5 | 3 | 4 | |||||||||||||||||||||||
| 5 | 17 | 15 | 5 | 3 | 1 | 5 | ||||||||||||||||||||||
| 6 | 17 | 15 | 13 | 5 | 3 | 1 | 6 | |||||||||||||||||||||
| 7 | 17 | 15 | 13 | 10 | 8 | 5 | 3 | 7 | ||||||||||||||||||||
| 8 | 22 | 20 | 17 | 15 | 10 | 8 | 5 | 3 | 8 | |||||||||||||||||||
| 9 | 17 | 15 | 13 | 12 | 10 | 8 | 5 | 3 | 1 | 9 | ||||||||||||||||||
| 10 | 22 | 20 | 17 | 15 | 12 | 10 | 8 | 5 | 3 | 1 | 10 | |||||||||||||||||
| 12 | 24 | 22 | 20 | 17 | 15 | 13 | 12 | 10 | 8 | 5 | 3 | 1 | 12 | |||||||||||||||
| 13 | 22 | 20 | 17 | 15 | 12 | 10 | 8 | 6 | 5 | 4 | 3 | 2 | 1 | 13 | ||||||||||||||
| 14 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 12 | 10 | 8 | 5 | 3 | 1 | 14 | |||||||||||||
| 15 | 24 | 22 | 20 | 17 | 15 | 13 | 12 | 10 | 8 | 6 | 5 | 4 | 3 | 2 | 1 | 15 | ||||||||||||
| 16 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 16 | |||||||||||
| 17 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 12 | 10 | 8 | 6 | 5 | 4 | 3 | 2 | 1 | 17 | ||||||||||
| 18 | 24 | 22 | 20 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 10 | 8 | 6 | 5 | 4 | 3 | 2 | 1 | 18 | |||||||||
| 20 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 20 | |||||||
| 21 | 24 | 22 | 20 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 21 | ||||||
| 24 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 24 | |||