6.6 Configuring Memory Mirroring
6.6 Configuring Memory Mirroring
This section describes how to configure memory mirroring.
Note - Configuring memory mirroring is optional. |
Note - To configure memory mirroring, you need to power off the SPARC M12-2. |
The SPARC M12-2 supports memory mirroring configurations to protect data through memory duplication. Data reliability increases, but the amount of available memory is halved.
The memory access controller controls writing of data to memory and reading of data from memory. The SPARC M12-2 configures the mirroring by grouping memory into sets controlled by two memory access controllers.
The memory access controller controls writing of data to memory and reading of data from memory. The SPARC M12-2 configures the mirroring by grouping memory into sets controlled by two memory access controllers.
Note - The memory grouped together in a mirroring group must all have the same capacity and be the same rank. |
- Execute the showfru command to check memory mirror mode.
Memory mirror mode is set in the factory default settings.
XSCF> showfru -a Device Location Memory Mirror Mode sb 00-0 cpu 00-0-0 no cpu 00-0-2 no |
- Execute the setupfru command, and set memory mirror mode to configure mirroring.
XSCF> setupfru [[-q] -{y|n}] -c function=mode device location |
- To configure memory mirroring, specify -c mirror=yes.
For "device," specify the devices making up the mirroring configuration. To configure memory mirroring for all the mounted CPUs in the SPARC M12-2, specify sb. To configure it only for the specified CPU, specify cpu.
For "location," specify the location of the target device.
If you specify sb for "device," specify 00-0 for "location." If you specify cpu for "device," use the format of 00-0-z. For z, specify 0 or 2.
- The following example sets all the mounted CPUs in the SPARC M12-2 to memory mirror mode.
XSCF> setupfru -c mirror=yes sb 00-0 Notice: - Logical domain config_name will be set to "factory-default". Memory mirror mode setting will be changed, Continue? [y|n] :y |
- Execute the showfru command to check the set memory mirror mode.
XSCF> showfru -a Device Location Memory Mirror Mode sb 00-0 cpu 00-0-0 yes cpu 00-0-2 yes |
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