Configuring Memory Mirroring - Fujitsu M10 Installation Manual

7.6

Configuring Memory Mirroring

This section describes how to configure memory mirroring.
Note - The memory mirror configurations are optional.
The SPARC M10 systems support 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 M10 systems configure 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.
1.
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 00-0-1 no
cpu 00-0-2 no
cpu 00-0-3 no
2.
Execute the setupfru command to configure memory mirroring.
XSCF> setupfru [ -m { y | n }] device location
To configure memory mirroring, specify -m y.
For device, specify the device for which to configure the mirroring. To configure
memory mirroring for all the CPUs mounted on the specified system board
(PSB), specify sb. To configure it only for the specified CPU, specify cpu.
For location, specify the location of the target device. You can specify it in the
xx-0-z format. For xx, specify a system board number. For z, specify a CPU chip
number from 0 to 3.
The following example sets all the CPUs mounted on physical system board 00-0
to memory mirror mode.
XSCF> setupfru -m y sb 00-0
Chapter 7 Making the Initial System Settings 213