Note: POST gives a warning message when online-sparing cannot be enabled
on both branches. However, no warning message is given when online-sparing is
enabled on one branch and disabled on the other.
In the configuration that you use, install the largest DIMMs first.
Table 19. Online-spare DIMM configurations, basic scheme
Number of
DIMMs DIMM connectors Results
4 1 and 4 (largest DIMMs)
2 and 5
Online-sparing on branch 0
6 1 and 4 (largest DIMMs)
2 and 5
3 and 6
Online-sparing on branch 0
8 1 and 4 (largest DIMMs)
2 and 5
3 and 6
7 and 10 (dual-rank DIMMs only)
Online-sparing on branch 0
Online-sparing on dual-rank DIMMs on
branch 1
10 1 and 4 (largest DIMMs)
2 and 5
3 and 6
7 and 10
8 and 11
Online-sparing on branch 0
Online-sparing on branch 1
12 1 and 4 (largest DIMMs)
2 and 5
3 and 6
7 and 10
8 and 11
9 and 12
Online-sparing on branch 0
Online-sparing on branch 1
Table 20. Online-spare DIMM configurations, alternative scheme (requires BIOS code
version 1.04 or later)
Number
of DIMMs DIMM connectors Results
4 7 and 10 (largest DIMMs)
8 and 11
Online-sparing on branch 1
6 7 and 10 (largest DIMMs)
8 and 11
9 and 12
Online-sparing on branch 1
8 7 and 10 (largest DIMMs)
8 and 11
9 and 12
1 and 4 (dual-rank DIMMs only)
Online-sparing on branch 1
Online-sparing on dual-rank DIMMs on
branch 0
10 1 and 4 (largest DIMMs)
2 and 5
7 and 10
8 and 11
9 and 12
Online-sparing on branch 0
Online-sparing on branch 1
12 N/A N/A
90 ThinkServer RD120 server Machine Types 6444, 6445, 6446, and 6447: Hardware Maintenance Manual
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