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CPU2
6
5
4
6
10
11
12
13
1
2
9
8
7
6
5
Figure 37. Memory connectors associated with each microprocessor for memory mirroring
The following table shows the installation sequence for installing DIMMs in memory-mirroring mode:
Table 18. Memory mirroring mode DIMM population sequence
Number of DIMMs
First pair of DIMMs
Second pair of DIMMs
Third pair of DIMMs
Fourth pair of DIMMs
Fifth pair of DIMMs
Sixth pair of DIMMs
DIMM connectors 7, 8, 9, 16, 17, and 18 are not used in memory-mirroring mode.
Online-spare memory
The memory online-spare feature disables the failed memory from the system configuration and activates an
online-spare DIMM to replace the failed active DIMM.
You can enable either online-spare memory or memory mirroring in the Setup utility (see
utility" on page
517). When you use the memory online-spare feature, consider the following information:
• The memory online-spare feature is supported on server models with an Intel Xeon™ 5600 series
microprocessor.
• When you enable the memory online-spare feature, you must install three DIMMs per microprocessor at a
time. The first DIMM must be in channel 0, the second DIMM in channel 1, and the third DIMM in channel
2. The DIMMs must be identical in size, type, rank, and organization, but not in speed. The channels run at
the speed of the slowest DIMM in any of the channels.
• The maximum available memory is reduced to 2/3 of the installed memory when memory online-spare
mode is enabled. For example, if you install 72 GB of memory using RDIMMs, only 48 GB of addressable
memory is available when you use memory online-spare.
The following table shows the installation sequence for installing DIMMs for each microprocessor in memory
online-spare mode:
5
4
14
15
16
17 18
3
3
CPU1
1
2
4
3
2
1
Number of installed
microprocessor
1
1
1
2
2
2
DIMM connector
3, 6
2, 5
1, 4
12, 15
11, 14
10, 13
.
Chapter 5
Removing and replacing components
"Using the Setup
435
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