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Advanced O&M Command Reference

OceanStor 18000 and 18000F V5 Series V500R007

This document is applicable to OceanStor 18500 V5, 18800 V5, 18500F V5, and 18800F V5. Based on the CLI, this document describes how to use various commands classified by functions and how to set the CLI and manage the storage system through these commands. The document that you browse online matches the latest C version of the product. Click Download to download documents of other C versions.
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change controller dma_type

change controller dma_type


The change controller dma_type command is used to change the DMA mode of the controller enclosure. You can run this command to change the DMA mode of a controller enclosure.


change controller dma_type controller_id=? dma_type=?






ID of a controller.

To obtain the value, run "show controller general".


Mode of DMA.

The value can be "CPU_DMA" or "PCIE_DMA", where:

  • CPU_DMA: The mode of CPU_DMA.
  • PCIE_DMA: The mode of PCIE_DMA.


Developer view

Usage Guidelines

Suggestion: Run this command during off-peak hours. After setting the DMA mode, restart the controllers one by one to ensure service continuity.


Set the DMA mode of the controller enclosure where controller 0A resides to "PCIE_DMA".

developer:/>change controller dma_type controller_id=0A dma_type=PCIE_DMA 
DANGER: You are about to change the DMA mode of the controller enclosure. The controllers must be restarted for the change to take effect. 
Suggestion: Before performing this operation, note the following: 
1. The DMA mode can be changed when services are running. The change does not affect ongoing services, but it takes effect only after the controllers are restarted. 
2. You only need to configure the DMA mode on one controller. If you configure the DMA mode on multiple controllers, the configuration of the last controller prevails. 
Have you read danger alert message carefully?(y/n)y 
Are you sure you really want to perform the operation?(y/n)y 
Command executed successfully.

System Response


Updated: 2019-07-11

Document ID: EDOC1000181602

Views: 631836

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