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Advanced O&M Command Reference

OceanStor 18000 V3 Series V300R006

This document is applicable to OceanStor 18500 V3 and 18800 V3. 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 cache io_concurrent

change cache io_concurrent

Function

The change cache io_concurrent command is used to change the number of concurrent I/Os in volume cache and stripe cache.

Format

change cache io_concurrent base=? active_type=? req=? page=? mode=?

Parameters

Parameter

Description

Value

base=?

Cache type.

Possible values include "volume" and "stripe".

active_type=?

I/O type.

Possible values include "prefetch", "normal_destage", or "force_destage", where:

  • "prefetch": prefetch.
  • "normal_destage": normal data destaging.
  • "force_destage": forcible data destaging.

req=?

Number of concurrent REQ resources of the cache I/Os.

The value ranges from "0" to "16,384".

page=?

Number of concurrent page resources of the cache I/Os.

The value ranges from "0" to "2,621,440".

mode=?

Concurrence adjusting mode.

Possible values include "adjust" and "fastness", where:

  • "adjust": dynamic adjustment. The number concurrent resources of this cache type are dynamically adjusted based on requirements.
  • "fastness": fixed adjustment. The number concurrent resources of this cache type are set to a fixed value.

Views

Developer view

Usage Guidelines

Set the parameters properly. A too-large value may cause the system to overload and fail to run correctly, and a too-small value may cause system performance to degrade. This command can only be executed on the current controller.

Example

To change the number of concurrent I/Os in volume cache, run the following command.

developer:/>change cache io_concurrent base=volume active_type=prefetch req=256 page=65448 mode=fastness 
Command executed successfully.

System Response

None

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Updated: 2019-07-12

Document ID: EDOC1000138389

Views: 500130

Downloads: 85

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