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Advanced O&M Command Reference

OceanStor 5000, 5000F, 6000, and 6000F V5 Series V500R007

This document is applicable to OceanStor 5110 V5, 5110F V5, 5300 V5, 5500 V5, 5600 V5, 5800 V5, 6800 V5, 5300F V5, 5500F V5, 5600F V5, 5800F V5, and 6800F V5. Based on the CLI, this document describes how to use various commands classified by functionsand how to set the CLI and manage the storage system through these commands.
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change cache seqflow

change cache seqflow

Function

The change cache seqflow command is used to set sequence flow threshold parameters.

Format

change cache seqflow [ counter=? ] [ bitmap=? ] [ time=? ] [ distance=? ] [ iothreshold=? ] [ switch=? ]

change cache seqflow { disable_time=? | interval_distance=? | max_seqflow_multiple=? | hit_ratio=? | waste_ratio=? | hit_prefetch_ratio=? | seqflow_ratio=? | random_ratio=? | double_ratio=? | diff_hit_ratio=? | counter_threshold=? | first_prefetch_flag=? | limit_waste_ratio=? | limit_hit_ratio=? | ssd_read_disk_time=? | hdd_read_disk_time=? } *

Parameters

Parameter

Description

Value

counter=?

Sequence threshold.

The value must be an integer from 1 to 32.

bitmap=?

Bitmap threshold.

The value must be an integer from 1 to 16.

time=?

Time threshold.

The value must be an integer from 1 to 65535.

distance=?

Chunk distance threshold.

The value must be an integer from 1 to 32.

iothreshold=?

Prefetch I/O threshold.

The value must be an integer from 0 to 256.

switch=?

Auto-negotiable prefetch algorithm switch.

The value can be "On" or "Off",where:

  • "On": turns on the auto-negotiable prefetch algorithm switch.
  • "Off": turns off the auto-negotiable prefetch algorithm switch.

disable_time=?

Failure period of the sequence flow identification algorithm.

The value must be an integer from 1 to 65535.

interval_distance=?

Identification distance for the interval sequence flow.

The value must be an integer from 1 to 127.

max_seqflow_multiple=?

Maximum multiplier threshold of the sequence flow.

The value must be an integer from 1 to 63.

hit_ratio=?

Hit ratio threshold of the sequence flow identification algorithm.

The value must be an integer from 0 to 100.

waste_ratio=?

Waste ratio threshold of the sequence flow identification algorithm.

The value must be an integer from 0 to 100.

hit_prefetch_ratio=?

Hit prefetch ratio threshold of the sequence flow identification algorithm.

The value must be an integer from 0 to 100.

seqflow_ratio=?

I/O ratio threshold of the serial sequence flow.

The value must be an integer from 0 to 100.

random_ratio=?

Random I/O ratio threshold of the sequence flow identification algorithm.

The value must be an integer from 0 to 100.

double_ratio=?

Twice I/O ratio threshold of the sequence flow identification algorithm.

The value must be an integer from 0 to 100.

diff_hit_ratio=?

Differential hit ratio threshold of the sequence flow identification algorithm.

The value must be an integer from 0 to 100.

counter_threshold=?

Sequence degree threshold of the sequence flow identification algorithm.

The value must be an integer from 0 to 100.

first_prefetch_flag=?

First I/O triggering prefetch flag.

The value is "On" or "Off", where:

  • "On": turns on the first I/O prefetch.
  • "Off": turns off the first I/O prefetch.

limit_waste_ratio=?

Waste ratio threshold for the sequence flow identification algorithm to limit prefetch.

The value must be an integer from 0 to 100.

limit_hit_ratio=?

Hit ratio threshold for the sequence flow identification algorithm to limit prefetch.

The value must be an integer from 0 to 100.

ssd_read_disk_time=?

Time threshold for reading SSDs in the sequence flow identification algorithm.

The value must be an integer from 0 to 127.

hdd_read_disk_time=?

Time threshold for reading HDDs in the sequence flow identification algorithm.

The value must be an integer from 0 to 127.

Views

Developer view

Usage Guidelines

Use this command to set sequence flow threshold parameters.

Example

  • Set bitmap to 16.
    developer:/>change cache seqflow bitmap=16 
    WARNING: You are about to modify the cache sequence flow parameter. The operation affects system performance.  
    Suggestion: Before performing the operation, confirm that the cache sequence flowparameter is correct. 
    Have you read warning message carefully?(y/n)y 
    Are you sure you really want to perform the operation?(y/n)y 
    Command executed successfully.
  • Set the cache sequence flow hit ratio to 50.
    developer:/>change cache seqflow hit_ratio=50 
    WARNING: You are about to modify the cache sequence flow parameter. The operation affects system performance.  
    Suggestion: Before performing the operation, confirm that the cache sequence flowparameter is correct. 
    Have you read warning message carefully?(y/n)y 
    Are you sure you really want to perform the operation?(y/n)y 
    Command executed successfully.

System Response

None

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Updated: 2019-07-11

Document ID: EDOC1000181619

Views: 614093

Downloads: 242

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