Dell EMC OpenManage Command Line Interface Guide Version 9.1

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Omconfig Chassis Memorymode Or Omconfig Mainsystem Memorymode

Use the omconfig chassis memorymode or omconfig mainsystem memorymode command to specify the redundancy mode to use for the system memory in case of memory errors.

Redundant memory enables a system to switch to other available memory modules if unacceptable errors are detected in the modules that the system is currently using. The omconfig chassis memorymode or omconfig mainsystem memorymode command allows you to disable redundancy; when you disable redundancy, you instruct the system not to switch to other available memory modules when the memory module the system is using begins to encounter errors. To enable redundancy, choose among spare, mirror, raid, and DDDC.

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 1. Valid Parameters Of Omconfig Chassis Memorymode Or Omconfig Mainsystem Memorymode . This table lists the 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.

advanced ECC (advecc): Enables the two DRAM controllers to combine in 128-bit mode and provide optimized reliability. Memory that are not teamed by the controllers is not reported to the operating system.


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