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Advanced O&M Command Reference
OceanStor 2800 V5 V500R007

This document is applicable to OceanStor 2800 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 system cache

change system cache


The change system cache command is used to set the cache's high and low watermarks. After the high and low watermarks are set, the storage system synchronizes the dirty data from the cache to hard disks based on the settings.


change system cache { high_water_level=? | low_water_level=? } *





high_water_level=? Percentage of the high watermark.

The value is an integer ranging from 2 to 90.

low_water_level=? Percentage of the low watermark.

The value is an integer ranging from 1 to 80.


Developer view

Usage Guidelines

  • If the watermarks are set improperly, system performance may be affected.
  • Before running this command, ensure that the watermarks are set properly. It is recommended that the percentage of the low watermark range from 20 to 40 and that of the high watermark range from 70 to 90.
  • The percentage of the high watermark must be greater than that of the low watermark.


To set the percentage of the high watermark to "80%" and that of the low watermark to "30%", run the following command.

developer:/>change system cache high_water_level=80 low_water_level=30
Command executed successfully.

System Response


Updated: 2020-03-19

Document ID: EDOC1000181575

Views: 782589

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