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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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cache show prefetch

cache show prefetch

Function

The cache show prefetch command is used to view the prefetch information in a Cache.

Format

cache show prefetch info volumeId

cache show prefetch intelfactor

cache show prefetch maxlength

Parameters

Parameter

Description

Value

info

Type of prefetch information.

The value can be wastepages, status, or list.

  • wastepages: volume Cache and stripe Cache.
  • status: volume Cache.
  • list: stripe Cache.

volumeId

Volume ID.

The value ranges from 0 to 2^64 - 1.

intelfactor

Parameter for intelligent prefetch of Cache.

-

maxlength

The maximum length of prefetch.

The value can be from 4096 to 16384.

Views

Diagnostic view

Usage Guidelines

None

Example

View the number of waste prefetch pages in the cache object of volume 0.

admin:/diagnose>cache show prefetch wastepages 0 
Obj [0] prefetch waste pages detail:  
  Total prefetch pages(volume layer)       : 1 = 0(MB) 
  Total prefetch waste pages(volume layer) : 0 = 0(MB)

System Response

The following table describes the parameter meanings.

Parameter

Meaning

Total prefetch pages(volume layer)

Number of prefetched pages in layer 1 Cache.

Total prefetch waste pages(volume layer)

Number of wasted prefetched pages in layer 1 Cache.

Async prefetch status

Status of asynchronous prefetch.

Async prefetch threshold

Threshold of asynchronous prefetch.

Async prefetch threshold percent:

Percentage threshold of asynchronous prefetch.

volumeId

Volume ID of a Cache object.

objectId

ID of the Cache object.

lba

LBA of a request on the prefetch linked list.

len

Length of data in the REQ on the prefetch linked list.

endLba

LBA of the REQ end on the prefetch linked list.

step

Current prefetch progress.

req

REQ address on the prefetch linked list.

opCode

Operation code of the prefetch.

Max length

Maximum prefetch length.

Min length

Minimum prefetch length.

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Updated: 2019-07-11

Document ID: EDOC1000181619

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