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Dell PowerEdge M910 Technical Guide 23
7.5.2 Mirroring
For mirroring, the M910 will support 2P/4P configurations with 32 DIMMs only. When mirroring is
enabled, only half of the physical memory will be visible to the system software. A full copy of the
memory is maintained, and in the event of an uncorrectable error, the system will switch over to the
mirrored copy. In 2P mode, the mirroring will be inter-node with hemisphere mode enabled. In this
case, the memory controller (MBox) of CPU1 is mapped to the corresponding MBox of CPU2. The
figure below depicts the mirroring logic for 2P configurations. A, B, C and D represent the DIMM
socket groups.
Figure 5. PowerEdge M910 2P Mirroring
For 4-processor configurations, the PowerEdge M910 will also support mirroring in the inter-socket
mode (note that intra-socket is not possible in 4P because each CPU has only one MBox connected to
memory buffers). In this 4P case, the memory on CPU1 will be mirrored with memory on CPU3, while
memory on CPU2 is mirrored with memory on CPU4. Figure 6 depicts the mirroring logic for 2P
configurations. A,B,C and D represent the DIMM socket groups.
Figure 6. M910 4P Mirroring
CPU1
MBOX0
MBOX1
CPU2
MBOX0
MBOX1
DIMM1
DIMM2
DIMM3
DIMM4
DIMM5
DIMM6
DIMM7
DIMM8
A
DIMM1
DIMM2
DIMM3
DIMM4
DIMM5
DIMM6
DIMM7
DIMM8
C
DIMM1
DIMM2
DIMM3
DIMM4
DIMM5
DIMM6
DIMM7
DIMM8
D
DIMM1
DIMM2
DIMM3
DIMM4
DIMM5
DIMM6
DIMM7
DIMM8
B
CPU1
MBOX0
MBOX1
CPU3
MBOX0
MBOX1
CPU2
MBOX0
MBOX1
CPU4
MBOX0
MBOX1
DIMM1
DIMM2
DIMM3
DIMM4
DIMM5
DIMM6
DIMM7
DIMM8
A
DIMM1
DIMM2
DIMM3
DIMM4
DIMM5
DIMM6
DIMM7
DIMM8
C
DIMM1
DIMM2
DIMM3
DIMM4
DIMM5
DIMM6
DIMM7
DIMM8
B
DIMM1
DIMM2
DIMM3
DIMM4
DIMM5
DIMM6
DIMM7
DIMM8
D