Memory mirrored channel
Memory mirrored channel mode replicates and stores data on two pairs of DIMMs within two channels
simultaneously. If a failure occurs, the memory controller switches from the primary pair of memory DIMMs
to the backup pair of DIMMs.
You can enable memory mirrored in the Setup utility (see “Starting the Setup utility” on page 107).
When you use the memory mirrored channel feature, consider the following information:
• When you use memory mirrored channel, you must install a pair of DIMMs at a time. The two DIMMs in
each pair must be identical in size, type, and rank (single, dual, or quad), 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 half of the installed memory when memory mirrored is
enabled. For example, if you install 64 GB of memory using RDIMMs, only 32 GB of addressable memory
is available when you use memory mirrored channel.
The following diagram lists the DIMM connectors on each memory channel.
DIMM 3
DIMM 9
DIMM 6
DIMM 12
DIMM 2
DIMM 8
DIMM 5
DIMM 11
DIMM 1
DIMM 7
DIMM 4
DIMM 10
Microprocessor 1
DIMM 15
DIMM 21
DIMM 18
DIMM 24
DIMM 14
DIMM 20
DIMM 17
DIMM 23
DIMM 13
DIMM 19
DIMM 16
DIMM 22
Microprocessor 2
Channel
Channel
Figure 42. Connectors on each memory channel
Note:
You can install DIMMs for microprocessor 2 as soon as you install microprocessor 2; you do not have
to wait until all of the DIMM connectors for microprocessor 1 are filled.
The following table shows the installation sequence for memory mirrored mode:
Table 6. Memory mirrored channel mode DIMM population sequence
Number of DIMMs
Number of installed
microprocessor
DIMM connector
First pair of DIMMs
1
1, 4
Second pair of DIMMs
1
9, 12
Third pair of DIMMs
1
2, 5
Fourth pair of DIMMs
1
8, 11
Fifth pair of DIMMs
1
7, 10
Sixth pair of DIMMs
1
3, 6
64
System x3500 M4 Installation and Service Guide
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