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Chapter 2 Preparations
Memory Lock Step feature can be used under the following conditions:
•
Install DIMMs that operate in parallel in memory socket.
•
All the installed DIMMs should have the same capacity.
•
Refer to Chapter 2 (1. System BIOS) in "Maintenance Guide", run SETUP, change parameters as shown
below, save the settings, and exit from SETUP.
Advanced → Memory Configuration → Memory RAS Mode → Change to LockStep.
•
After restart, run SETUP again, and check if "Lock Step" is displayed for the following parameter.
Advanced → Memory Configuration → Memory Information → CPUx_DIMMx Status
•
Installation order depends on CPU configuration. See the figure below.
1CPU 構成
1CPU
2CPU 構成
2CPU
configuration
configuration
搭載順序
搭載順序
2
3
4
7
6
11
2
3
4
7
6
11
5
9
3
5
1
1
5
9
3
5
1
1
4
8
12
4
8
12
10
6
2
10
6
2
Memory Lock Step cannot be configured in the following cases:
•
Memory Lock Step between memory channels of different memory controllers (CPU)
•
Memory Lock Step within the same memory channel
Notes on Configuring Lock Step
In Memory Lock Step configuration, Memory RAS Mode menu is changed from "Lock Step" to "Independent"
in the following cases:
•
When you additionally install DIMMs that unable to configure Memory Lock Step
•
When you remove DIMMs that takes down Memory Lock Step
72
CPU1_DIMM 3
CPU1_DIMM 7
CPU1_DIMM 11
CPU1_DIMM 4
CPU1_DIMM 8
CPU1_DIMM 12
CPU1_DIMM 10
CPU1_DIMM 6
CPU1_DIMM 2
CPU1_DIMM 9
CPU1_DIMM 5
CPU1_DIMM 1
CPU2_DIMM 3
CPU2_DIMM 7
CPU2_DIMM 11
CPU2_DIMM 4
CPU2_DIMM 8
CPU2_DIMM 12
CPU2_DIMM 10
CPU2_DIMM 6
CPU2_DIMM 2
CPU2_DIMM 9
CPU2_DIMM 5
CPU2_DIMM 1
Express5800/R120d-2M User's Guide
1. Installing Internal Optional Devices
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