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9-48 Upgrading Your Server
The LockStep feature can be used under the following conditions:
Install two DIMMs that operate in parallel in memory socket.
All the installed DIMMs should have the same capacity.
Run SETUP (see Chapter 4), change parameters appropriately in the menu selected as
shown below, save the settings and exit from SETUP.
Select [Advanced] → [Memory Configuration submenu] → [Memory RAS Feature] →
[LockStep].
Install memory devices in the following order:
1-CPU
configuration
3rd
6th
2nd
5th
1st
4th
The following LockStep cannot be configured:
LockStep between memory channels of different memory controllers (CPU).
LockStep within the same memory channel.
Notes on Configuring LockStep
In LockStep configuration, [Memory RAS Mode] menu is changed from "LockStep" to
"Independent" in the following cases:
When you additionally install DIMMs that unable to configure LockStep
When you remove DIMMs that takes down the LockStep
REAR
2-CPU
FRONT
configuration
5th
11th
3rd
9th
1st
7th
8th
2nd
10th
4th
12th
6th
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