Lenovo 6446 Instrukcja Użytkownika Pobierz pdf (Strona 28)

switches from the active pair to the mirroring pair. Memory mirroring reduces the

amount of available memory. Enable memory mirroring through the

Configuration/Setup Utility program. See the section about using the

Configuration/Setup Utility program in the User Guide on the ThinkServer

Documentation DVD for details about enabling memory mirroring.

When you use memory mirroring, you must install two pairs of DIMMs at a time.

The four DIMMs in each group must be identical. See Table 3 for the DIMM

connectors that are in each group.

Table 3. Memory mirroring DIMM installation sequence

Group DIMM connectors

1 1, 4, 7, and 10

2 2, 5, 8, and 11

3 3, 6, 9, and 12

Table 4. Memory mirroring DIMM functions

Group Active DIMMs Mirroring DIMMs

1 1, 4 7, 10

2 2, 5 8, 11

3 3, 6 9, 12

Online-spare memory

The server supports online-spare memory. This feature disables the failed memory

from the system configuration and activates an online-spare pair of DIMMs to

replace the failed active DIMM pair.

Online-spare memory reduces the amount of available memory. Before you can

enable this feature, you must install up to two additional pairs of DIMMs. The

online-spare DIMM pairs must be the same speed, type, and the same size as, or

larger than, the largest active DIMM pairs.

Enable online-spare memory through the Configuration/Setup Utility program. The

BIOS code assigns the online-spare DIMM pairs according to your DIMM

configuration. Online-sparing is enabled on a memory branch basis; the BIOS code

does not enable online-sparing on a branch that cannot support online-sparing. See

the illustration on page 11 for the memory branch structure. DIMM ranks are

online-spared if the DIMMs are installed according to the rules in Table 5 on page

15 or Table 6 on page 15.

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.

Online-spare configurations are supported for each branch. See Table 5 on page 15

and Table 6 on page 15 for the online-spare DIMM connector assignments.

Important: Table 5 on page 15 shows the default DIMM online-spare scheme. If the

BIOS code level is version 1.04 or later, you can install the DIMMs according to the

scheme shown in Table 6 on page 15 instead.

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