used to mirror the active memory modules. In the event of an uncorrectable error, the system switches over to the mirrored copy. This
ensures Single Device Data Correction (SDDC) and multi-bit protection.
The installation guidelines for memory modules are as follows:
•
Memory modules must be identical in size, speed, and technology.
•
Memory modules must be populated in sets of 6 per CPU to enable memory mirroring.
Table 40. Memory population rules
Processor
Configuration
Memory population
Memory population information
Dual CPU (Start with
CPU1. CPU1 and CPU2
population should
match)
Optimized (Independent channel)
population order
C1{1}, C2{1}, C1{2}, C2{2}, C1{3},
C2{3}...
Odd amount of DIMMs per CPU
allowed.
Mirroring population order
C1{1, 2, 3, 4, 5, 6}, C2{1, 2, 3, 4, 5,
6}, C1{7, 8, 9, 10, 11, 12}, C2{7, 8,
9, 10, 11, 12}
Mirroring is supported with 6 or 12
DIMMs per CPU.
Single rank sparing population order C1{1}, C2{1}, C1{2}, C2{2}, C1{3},
C2{3}...
Populate in this order, odd amount per
CPU allowed. Requires two ranks or
more per channel.
Multi rank spare population order
C1{1}, C2{1}, C1{2}, C2{2}, C1{3},
C2{3}, C1{4}, C2{4}, C1{5},
C2{5}...
Populate in this order, odd amount per
CPU allowed. Requires three ranks or
more per channel.
Fault resilient population order
C1{1, 2, 3, 4, 5, 6}, C2{1, 2, 3, 4, 5,
6}, C1{7, 8, 9, 10, 11, 12}, C2{7, 8,
9, 10, 11, 12}
Supported with 6 or 12 DIMMs per
CPU.
Quad CPU (Start with
CPU1. CPU1, CPU2,
CPU3, and CPU4
population should
match)
Optimized (Independent channel)
population order
C1{1},C2{1},C3{1},C4{1},C1{2},C
2{2},C3{2},C4{2}…
Odd amount of DIMMs per CPU
allowed.
Mirroring population order
C1{1,2,3,4,5,6},C2{1,2,3,4,5,6},C3{
1,2,3,4,5,6},C4{1,2,3,4,5,6}…
Mirroring is supported with 6 or 12
DIMMs per CPU.
Single rank sparing population order C1{1},C2{1},C3{1},C4{1},C1{2},C
2{2},C3{2},C4{2}…
Populate in this order, odd amount per
CPU allowed. Requires two ranks or
more per channel.
Multi rank spare population order
C1{1},C2{1},C3{1},C4{1},C1{2},C
2{2},C3{2},C4{2}…
Populate in this order, odd amount per
CPU allowed. Requires three ranks or
more per channel.
Fault resilient population order
C1{1,2,3,4,5,6},C2{1,2,3,4,5,6},C3{
1,2,3,4,5,6},C4{1,2,3,4,5,6}…
Supported with 6 or 12 DIMMs per
CPU.
Removing a memory module
Prerequisites
1
Follow the safety guidelines listed in
2
Follow the procedure listed in
Before working inside your system
.
3
If applicable, remove the air shroud.
WARNING:
Allow the memory modules to cool after you power off the system. Handle the memory modules by the card edges
and avoid touching the components or metallic contacts on the memory module.
CAUTION:
To ensure proper system cooling, memory module blanks must be installed in any memory socket that is not occupied.
Remove memory module blanks only if you intend to install memory modules in those sockets.
Installing and removing system components
99
