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•
Memory modules must be identical in size, speed, and technology.
•
Memory modules installed in memory module sockets with white release levers must be identical and
the same rule applies for sockets with black and green release tabs. This ensures that identical
memory modules are installed in matched pairs—for example, A1 with A3, A2 with A4, A5 with A7, and
so on.
Fault Resilient Memory
Fault Resilient Memory (FRM) mode operates with the parts of redundant system memory, leaving the rest
of the system memory in non-mirror mode. It reduces the cost of memory mirroring by mirroring just the
critical portion of memory versus mirroring the entire memory space. It provides additional flexibility to
optimize cost, performance, or RAS by providing high degree of reliability to memory at lower cost than
mirroring the entire system memory.
Memory Mirroring is a RAS feature that enables duplicating memory content at a remote DIMM in the
partition. This capability enables high data availability from memory subsystem. Fault Resilient Memory
enables you to select the segments of system memory that contains the most critical code.
Sample memory configurations
The following table shows sample memory configurations for a single processor that follow the
appropriate memory guidelines stated in this section.
NOTE: DIMMs populated must be identical for each riser. In the mirroring mode, only one of the
two CPUs is populated.
Table 2. Memory configurations—single riser
Memory
System
Mode
Capacity (in
GB)
64
96
128
192
Advanced
64
ECC
96
Lockstep
128
128
192
256
384
Optimized
32
Population
48
DIMM
Number of
Size (in
DIMMs
GB)
8
8
8
12
8
16
8
24
16
4
16
6
16
8
32
4
32
6
32
8
32
12
8
4
8
6
DIMM Slot Population for CPU 1 ( Riser A
and B)
2
6
10 4
8
12 1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
5
9
3 7 11
X
X
X
X
X X
X
X
X X
X
X
X
X X X
X
X
X
X
X X
X
X
X X
X
X
X
X
X X
X
X
X X
X
X
X
X X X
X
X
X
X
61
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Troubleshooting
