Owners Manual

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 34. Memory configurations—single riser
Memory Mode System
Capacity (in
GB)
DIMM Size
(in GB)
Number of
DIMMs DIMM Slot Population for CPU 1 (Riser A)
Advanced ECC
Lockstep
2 6 10 4 8 12 1 5 9 3 7 11
64 8 8 X X X X
96 8 12 X X X X X X
128 8 16 X X X X X X X X
192 8 24 X X X X X X X X X X X X
64 16 4 X X
96 16 6 X X X
128 16 8 X X X X
128 32 4 X X
192 32 6 X X X
256 32 8 X X X X
384 32 12 X X X X X X
Optimized
Population
(Independent
Channel)
32 8 4 X X
48 8 6 X X X
64 8 8 X X X X
80 8 10 X X X X X
96 16 6 X X X
128 16 8 X X X X
96 16 6 X X X
128 16 8 X X X X
192 32 6 X X X
256 32 8 X X X X
192 32 6 X X X
256 32 8 X X X X
384 32 12 X X X X X X
70 Installing and removing system components