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Advanced O&M Command Reference

OceanStor 2000, 5000, and 6000 V3 Series V300R006

This document is applicable to OceanStor 2200 V3, 2600 V3 Video Surveillance Edition, 2600 V3, 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 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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show ddp compress_info

show ddp compress_info

Function

The show ddp compress_info command is used to query compression information about a data block.

Format

show ddp compress_info domain_id=? extent_id=? extent_offset=? storage_tier=? gang_flag=? controller=?

Parameters

Parameter

Description

Value

domain_id=?

ID of the domain that you want to query.

To obtain the value, run the "show file_system general" or "show lun dedup_compress" command.

extent_id=?

ID of the extent that you want to query.

The value ranges from 0 to 18,446,744,073,709,551,615.

extent_offset=?

Offset of the extent that you want to query.

The value ranges from 0 to 4,294,967,295.

storage_tier=?

Type of the storage media.

The value can be "SSD", "SAS", or "NearLine SAS", where:

  • "SSD": SSD.
  • "SAS ": SAS disk.
  • "NearLine SAS": NL-SAS disk.

gang_flag=?

Gang chunk flag.

The value can be "true" or "false", where:

  • "true": gang chunk.
  • "false": non-gang chunk.

controller=?

Controller ID.

The value is in the format of "XA" or "XB" or "XC" or "XD", where the "X" is an integer ranging from 0 to 3, for example: "0A", "1C".

Views

Developer view

Usage Guidelines

Before running this command, specify a controller ID.

OceanStor 2100 V3/6800 V3/2600 V3/5300 V3/5500 V3/5600 V3/5800 V3 storage systems support this command.

Example

Query compression information about the data block with gang chunk flag "false" and storage media "SAS" on extent "72130162894987266" with offset "0" in domain "0".

developer:/>show ddp compress_info domain_id=0 extent_id=72130162894987266 extent_offset=0 storage_tier=SAS gang_flag=false controller=0A 
  Is Compressed Data            : Yes        
  Tag                           : 3671775962  
  Original Data Checksum        : 3671775962  
  Compressed Data Checksum      : 651771316  
  Version                       : 16         
  Original Data Length          : 65536      
  Compressed Data Length        : 18908 
  Compress Algorithm            : 0          
  Compress Header Length        : 32         
  Block Number                  : 1          
  Private Length                : 4          
  Original Data Checksum Flag : False      
  Compressed Data Checksum Flag : True       
  Block Length                  : 65536 

System Response

The following table describes the parameter meanings.

Parameter

Meaning

Is Compressed Data

Whether data is compressed.

Tag

Compression flag.

Original Data Checksum

Check value of original data.

Compressed Data Checksum

Check value of compressed data.

Version

Version of the compression algorithm library.

Original Data Length

Length of original data.

Compressed Data Length

Length of compressed data.

Compress Algorithm

Compression algorithm.

Compress Header Length

Length of the compression header.

Block Number

Number of blocks that are compressed together.

Private Length

Length of compressed private information.

Original Data Checksum Flag

Check flag of original data.

Compressed Data Checksum Flag

Check flag of compressed data.

Block Length

Length of the combined block.

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Updated: 2019-07-12

Document ID: EDOC1000138402

Views: 629385

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