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 158). 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 13. 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
Installing a DIMM
About this task
To install a DIMM, complete the following steps.
Chapter 2. Installing optional devices 121
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