IBM 9228 Service Guide - Page 61

Number of DIMMs, DIMM connections, normal mode.

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- The minimum memory configuration is four identical DIMMs. You must install identical pairs of DIMMs in all four DIMM connections (same size, type, speed, and technology). These DIMMs must span both branches and all four channels. For example, when you assign the first four DIMMs, you must install two DIMMs in branch 0 (one in channel 0 and one in channel 1) and two DIMMs in branch 1 (one in channel 2 and one in channel 3). See the following table for the installation sequence for operating in the mirroring mode. - When you upgrade the computer to eight DIMMs, the DIMMs in both branches must be identical (same size, type, speed, and technology). - Both branches operate in dual-channel mode. The following table shows the DIMM configuration upgrade sequence (mirroring mode). Number of DIMMs 4 8 DIMM connections 1, 3, 5, 7 1, 3, 5, 7, 2, 4, 6, 8 - Online-spare memory disables a failed pair of DIMMs from the system configuration and activates an online-spare pair of DIMMs to replace the failed pair of DIMMs. For an online-spare pair of DIMMs to be activated, you must have installed an additional pair of DIMMs of the same speed, type, size (or larger), and technology as the failed pair of DIMMs. When you use online-spare memory, consider the following information: - You cannot enable online-spare memory while the computer is operating in mirroring mode. - The minimum memory configuration is two double-rank DIMMs installed in branch 0, DIMM connection 1 (in channel 0) and DIMM connection 3 (in channel 1). - The spare pair of DIMMs must be the same speed, type, size (or larger), and technology as the failed pair of DIMMs. - Branch 0 and branch 1 operate independently. v The following notes apply when the computer operates in the non-mirroring mode (normal mode). - The computer comes with two 512 MB DIMMs installed in DIMM connectors 1 and 3. The second pair of DIMMs must be installed in DIMM connectors 5 and 7. The third pair of DIMMs must be installed in DIMM connectors 2 and 4. The fourth pair of DIMMs must be installed in DIMM connectors 6 and 8. - DIMMs must be installed in matched pairs. For example, the DIMMs in DIMM connector 1 and 3 must be identical to each other, but do not have to be identical to the DIMMs in DIMM connector 5 and 7. But the DIMMs in DIMM connector 5 and 7 must be identical to each other. The DIMMs in each pair must be the same size, speed, type, and technology as each other but do not have to match the other pairs. You can mix compatible DIMMs from various manufacturers. See the following table for the DIMM configuration upgrade sequence non-mirroring mode (normal mode). The following table shows the DIMM configuration upgrade sequence (non-mirroring mode). Number of DIMMs First pair DIMM connections 1, 3 Chapter 4. Removing and replacing computer components 43

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-
The minimum memory configuration is four identical DIMMs. You must
install identical pairs of DIMMs in all four DIMM connections (same size,
type, speed, and technology). These DIMMs must span both branches and
all four channels. For example, when you assign the first four DIMMs, you
must install two DIMMs in branch 0 (one in channel 0 and one in channel
1) and two DIMMs in branch 1 (one in channel 2 and one in channel 3).
See the following table for the installation sequence for operating in the
mirroring mode.
-
When you upgrade the computer to eight DIMMs, the DIMMs in both
branches must be identical (same size, type, speed, and technology).
-
Both branches operate in dual-channel mode.
The following table shows the DIMM configuration upgrade sequence
(mirroring mode).
Number of DIMMs
DIMM connections
4
1, 3, 5, 7
8
1, 3, 5, 7, 2, 4, 6, 8
–
Online-spare memory disables a failed pair of DIMMs from the system
configuration and activates an online-spare pair of DIMMs to replace the failed
pair of DIMMs. For an online-spare pair of DIMMs to be activated, you must
have installed an additional pair of DIMMs of the same speed, type, size (or
larger), and technology as the failed pair of DIMMs. When you use
online-spare memory, consider the following information:
-
You cannot enable online-spare memory while the computer is operating in
mirroring mode.
-
The minimum memory configuration is two double-rank DIMMs installed in
branch 0, DIMM connection 1 (in channel 0) and DIMM connection 3 (in
channel 1).
-
The spare pair of DIMMs must be the same speed, type, size (or larger),
and technology as the failed pair of DIMMs.
-
Branch 0 and branch 1 operate independently.
v
The following notes apply when the computer operates in the non-mirroring mode
(normal mode).
–
The computer comes with two 512 MB DIMMs installed in DIMM connectors 1
and 3. The second pair of DIMMs must be installed in DIMM connectors 5
and 7. The third pair of DIMMs must be installed in DIMM connectors 2 and 4.
The fourth pair of DIMMs must be installed in DIMM connectors 6 and 8.
–
DIMMs must be installed in matched pairs. For example, the DIMMs in DIMM
connector 1 and 3 must be identical to each other, but do not have to be
identical to the DIMMs in DIMM connector 5 and 7. But the DIMMs in DIMM
connector 5 and 7 must be identical to each other. The DIMMs in each pair
must be the same size, speed, type, and technology as each other but do not
have to match the other pairs. You can mix compatible DIMMs from various
manufacturers. See the following table for the DIMM configuration upgrade
sequence non-mirroring mode (normal mode).
The following table shows the DIMM configuration upgrade sequence (non-mirroring
mode).
Number of DIMMs
DIMM connections
First pair
1, 3
Chapter 4. Removing and replacing computer components
43