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Advanced O&M Command Reference

OceanStor 2800 V3 V300R006

This document is applicable to OceanStor 2800 V3. 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. 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 chunk_meta

show ddp chunk_meta


The show ddp chunkmeta command is used to query the details about deduplication and compression metadata, including deduplication flag, compression flag, fingerprint information, and data verification value.


show ddp chunk_meta domain_id=? chunk_id=? controller=?






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.


ID of the chunk that you want to query.

The value ranges from 1 to 18446744073709551615.


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".


Developer view

Usage Guidelines

  • Before running this command, confirm that you have selected the correct domain ID and chunk ID.
  • When runnning this command, specify a controller ID.


To query the information about the deduplication and compression metadata whose domain ID is "0" and chunk ID is "1024".

developer:/>show ddp chunk_meta domain_id=0 chunk_id=1024 controller=0A 
Chunk ID : 1024 
Extent ID : 0xe042004000600f 
Offset : 2832 
Physical Length : 8 
Gang Flag : 0 
Storage Tier : SAS 
Checksum Value : 44253 
Fingerprint : e4960db1482833ef2cc50b567ad42177ca949d96 
Reference Count : 1 
Is Compressed : No 
Is Deduped : Yes 
Compress Index : 1 
Compress Number : 1 
Ditto Flag : 0 
Logic Length : 8 
Transaction Number : 5 
Checksum Flag : 2

System Response

The following table describes the parameter meanings.



Chunk ID

Chunk ID.

Extent ID

Extent ID of a physical chunk.


Extent offset of a physical chunk. Unit: section.

Physical Length

Chunk length. Unit: section.

Gang Flag

Gang chunk flag.

Storage Tier

Storage tier.

Checksum Value

Chunk verification value.


Chunk fingerprint.

Reference Count

Chunk reference count.

Is Compressed

Whether a chunk is compressed.

Is Deduped

Whether a chunk is deduplicated.

Compress Index

Compressed chunk index.

Compress Number

Compression number.

Ditto Flag

Redundant chunk flag.

Logic Length

Original data length of a chunk. Unit: section.

Transaction Number

Chunk flushing transaction ID.

Checksum Flag

Verification flag.

Updated: 2019-07-12

Document ID: EDOC1000138381

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