IBM 7945E2U User Manual - Page 125

Online-spare memory, DIMMs, Number of installed, microprocessors, DIMM connector, Installed

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The following table lists the installation sequence for installing DIMMs in memory-mirroring mode. Table 10. Memory-mirroring mode DIMM population sequence DIMMs Number of installed microprocessors DIMM connector First pair of DIMMs 1 3, 6 Second pair of DIMMs 1 2, 5 Third pair of DIMMs 1 1, 4 Fourth pair of DIMMs 2 12, 15 Fifth pair of DIMMs 2 11, 14 Sixth pair of DIMMs 2 10, 13 Note: DIMM connectors 7, 8, 9, 16, 17, and 18 are not used in memory-mirroring mode. When you install or remove DIMMs, the server configuration information changes. When you restart the server, the system displays a message that indicates that the memory configuration has changed. Online-spare memory The server supports online-spare memory. This 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 "Using the Setup utility" on page 144). When you use the memory online-spare feature, consider the following information: v The memory online-spare feature is supported on server models with an Intel Xeon™ 5600 series microprocessor. v 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 online-spare 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. v 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 and the online-spare DIMM in memory online-spare mode: Table 11. Memory online-spare mode DIMM population sequence Installed Microprocessor DIMM connector Microprocessor 1 3, 6, 9 3, 6, 9, 2, 5, 8 3, 6, 9, 2, 5, 8, 1, 4, 7 Microprocessor 2 12, 15, 18, 12, 15, 18, 11, 14, 17, 12, 15, 18, 11, 14, 17, 10, 13, 16 Chapter 2. Installing optional devices 109

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The following table lists the installation sequence for installing DIMMs in
memory-mirroring mode.
Table 10. Memory-mirroring mode DIMM population sequence
DIMMs
Number of installed
microprocessors
DIMM connector
First pair of DIMMs
1
3, 6
Second pair of DIMMs
1
2, 5
Third pair of DIMMs
1
1, 4
Fourth pair of DIMMs
2
12, 15
Fifth pair of DIMMs
2
11, 14
Sixth pair of DIMMs
2
10, 13
Note:
DIMM connectors 7, 8, 9, 16, 17, and 18 are not used in memory-mirroring mode.
When you install or remove DIMMs, the server configuration information changes.
When you restart the server, the system displays a message that indicates that the
memory configuration has changed.
Online-spare memory
The server supports online-spare memory. This 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 “Using the Setup utility” on page 144). When you
use the memory online-spare feature, consider the following information:
v
The memory online-spare feature is supported on server models with an Intel
Xeon
™
5600 series microprocessor.
v
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 online-spare 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.
v
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 and the online-spare DIMM in memory online-spare mode:
Table 11. Memory online-spare mode DIMM population sequence
Installed
Microprocessor
DIMM connector
Microprocessor 1
3, 6, 9
3, 6, 9, 2, 5, 8
3, 6, 9, 2, 5, 8, 1, 4, 7
Microprocessor 2
12, 15, 18,
12, 15, 18, 11, 14, 17,
12, 15, 18, 11, 14, 17, 10, 13, 16
Chapter 2. Installing optional devices
109