Command Line Interface Guide

Spare mode disables a bank of system memory in which a correctable memory event is detected, enables
the spare bank, and copies all the data from the original bank to the spare bank. Spare bank requires at
least three banks of identical memory; the operating system does not recognize the spare bank.
Mirror mode switches to a redundant copy of memory when an uncorrectable memory event is detected.
After switching to the mirrored memory, the system does not switch back to the original system memory
until the next reboot. The operating system does not recognize half of the installed system memory in
this mode.
RAID mode provides an extra level of memory checking and error recovery at the expense of some
memory capacity.
The DDDC mode enables double device data correction. This ensures data availability after hard failure of
x4 DRAM.
NOTE: This command is applicable only on systems prior to PowerEdge 12G systems. On
PowerEdge 12G systems, memorymode is grouped under Memory Settings of the BIOS setup
group. For more information, see BIOS Setup Groups on PowerEdge 12G Systems.
To configure the attribute on systems prior to PowerEdge 12G, see the following table. The table displays
the valid parameters for the command.
Table 27. Valid Parameters Of Omconfig Chassis Memorymode Or Omconfig Mainsystem Memorymode
name=value pair 1 Description
index=<n> Number of the chassis where the memory module
resides (the default is chassis 0, the main system
chassis).
redundancy=spare | mirror | disabled | raid5 | dddc
spare: Disables the memory module that has a
correctable memory event and copies the failing
module’s data to a spare bank.
mirror: Switches the systems to a mirrored copy of
the memory if the failing module has an
uncorrectable memory event. In the mirror mode,
the operating system does not switch back to the
original module until the system reboot.
disabled: Indicates that the system is not to use
other available memory modules if uncorrectable
memory events are detected.
raid5: Method of system memory configuration.
This is logically similar to the RAID-5 mode used in
hard drive storage systems. This memory mode
provides an extra level of memory checking and
error recovery at the expense of some memory
capacity. The RAID mode supported is RAID level 5
striping with rotational parity.
dddc: The dddc mode enables double device data
correction. This ensures data availability after hard
failure of x4 DRAM.
opmode=mirror | optimizer | advecc
mirror: Switches the systems to a mirrored copy of
the memory if the failing module has an
uncorrectable memory event. In the mirror mode,
the operating system does not switch back to the
original module until the system reboots.
optimizer: Enables the DRAM controllers to
operate independently in 64-bit mode and provide
optimized memory performance.
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