Mirroring mode installation order
Memory-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.
Memory mirroring reduces the maximum available memory by half of the installed memory. For example, if the server has 64 GB of installed memory, only 32 GB of addressable memory is available when memory mirroring is enabled.
Mixing DIMMs with different capacity is not allowed. All DIMMs installed must be identical in capacity, density, architecture,
Mirroring is supported inside a cluster between two memory controllers. Mirroring is across adjacent memory controllers, that is, IMC 0 and 1, 2 and 3, and so forth.
Mirroring across IMC 1 and 2 is not supported for example.
BIOS should configure one as the primary and the other as the secondary.
Mirrored regions need to be of identical memory densities and capacities.
Mirroring is supported in 1LM.
Mirroring is within a pair of channels. Three-channel mirroring is not supported.
Partial Memory Mirroring is a sub-function of memory mirroring. It requires following the memory installation order of memory mirroring mode.
Mirroring mode population sequence
SC750 V4 supports fully populated processors only (two processors per node)
| CPU | CPU 1 | |||||||||||
| iMC | 11 | 10 | 9 | 8 | 7 | 6 | 0 | 1 | 2 | 3 | 4 | 5 |
| Memory channel | 11 | 10 | 9 | 8 | 7 | 6 | 0 | 1 | 2 | 3 | 4 | 5 |
| DIMM slot number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
| CPU | CPU 2 | |||||||||||
| iMC | 5 | 4 | 3 | 2 | 1 | 0 | 6 | 7 | 8 | 9 | 10 | 11 |
| Memory channel | 5 | 4 | 3 | 2 | 1 | 0 | 6 | 7 | 8 | 9 | 10 | 11 |
| DIMM slot number | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 |
Sub NUMA Clustering 3 (SNC3) is supported and can be enabled in UEFI.
Software Guard Extensions (SGX) is supported. See Enable Software Guard Extensions (SGX) to enable this feature.