Memory Mirroring In Independent Memory Mode - IBM System x3850 X6 Installation And Service Manual

Memory mirroring in independent memory mode

Use this information for notes and details about using the memory mirroring
feature in independent memory mode.
To enable the memory mirroring feature in independent memory mode through
the Setup utility, select System Settings → Memory → Memory Mode. For more
information, see "Using the Setup utility" on page 126. For more information and
notes about installing DIMMs, see "Installing a memory module" on page 47 and
"Independent memory mode" on page 55..
Consider the following information when using the memory mirroring feature in
independent memory mode:
v Independent memory mode provides the most efficient performance.
v You can populate DIMMs in any order and there are no matching requirements.
v When you operate in this mode, the memory channel operates at twice the
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System x3850 X6 and x3950 X6 Types 3837 and 3839: Installation and Service Guide
Table 12. DIMM population sequence for independent memory mode
DIMM installation order
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
However, the DIMM population sequence in the following table will provide the
best performance when operating in the supported memory modes.
DDR3 data rate.
Independent mode with
memory mirroring disabled
DIMM connector 9
DIMM connector 6
DIMM connector 1
DIMM connector 10
DIMM connector 15
DIMM connector 24
DIMM connector 19
DIMM connector 16
DIMM connector 8
DIMM connector 5
DIMM connector 2
DIMM connector 11
DIMM connector 14
DIMM connector 23
DIMM connector 20
DIMM connector 17
DIMM connector 7
DIMM connector 4
DIMM connector 3
DIMM connector 12
DIMM connector 13
DIMM connector 22
DIMM connector 21
DIMM connector 18
Independent mode with
memory mirroring enabled
DIMM connectors 9 and 19
DIMM connectors 6 and 16
DIMM connectors 1 and 15
DIMM connectors 10 and 24
DIMM connectors 8 and 20
DIMM connectors 5 and 17
DIMM connectors 2 and 14
DIMM connectors 11 and 23
DIMM connectors 7 and 21
DIMM connectors 4 and 18
DIMM connectors 3 and 13
DIMM connectors 12 and 22