Command Line Interface Guide

126 omconfig: Managing Components Using the Instrumentation Service
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 yx2x
systems. To configure the attribute on PowerEdge yx2x systems, refer Table 4-4.
Table 4-9 shows the valid parameters for the command.
Table 4-9. 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.