Memory Sparing Support - Dell PowerEdge DR715 Hardware Owner's Manual

Table 3-1. Memory Configurations
Total System Memory
Single-
Processor
System
1 GB
2 GB
2 GB
4 GB
4 GB
6 GB
8 GB
8 GB
12 GB
16 GB

Memory Sparing Support

Memory sparing is supported in single- or dual-processor systems that have one
of the fully populated memory configurations shown in Table 3-1. The memory
sparing feature must be enabled in the Memory Information screen of the
System Setup program. See "Entering the System Setup Program" on page 43.
To use memory sparing, you must disable node interleaving.
Memory sparing is applied independently to the two groups of DIMMs on the
same sides of the processor sockets. To support memory sparing, all DIMM
sockets within a DIMM group must be populated.
When enabled, memory sparing allocates and reserves ranks of memory from
the installed DIMMs to act as spare memory in the event of a memory
channel failure. A memory channel uses paired DIMMs; for memory sparing
to work, DIMMs must be paired as spares also.
Memory sparing allocates only the first rank of memory of a DIMM. For a
single-rank DIMM, the entire capacity of the DIMM must be allocated for
sparing along with the adjacent single-rank DIMM to spare a memory
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Installing System Components
Dual-Processor DIMM A1/
System
2 GB 512 MB
4 GB 512 MB
4 GB 1 GB
8 GB 1 GB
8 GB 2 GB
12 GB 2 GB
16 GB 2 GB
16 GB 4 GB
24 GB 4 GB
32 GB 4 GB
DIMM Socket
DIMM A2/
DIMM B1 DIMM B2
512 MB
512 MB
1 GB
1 GB
2 GB
2 GB
2 GB
4 GB
4 GB
4 GB
DIMM A3/ DIMM A4/
DIMM B3 DIMM B4
512 MB 512 MB
1 GB 1 GB
1 GB 1 GB
2 GB 2 GB
2 GB 2 GB
4 GB 4 GB