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Advanced O&M Command Reference

OceanStor 2800 V5 V500R007

This document is applicable to OceanStor 2800 V5. 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 mds_info

show ddp mds_info


The show ddp mds_info command is used to query information about the deduplication module, including the cache hit ratio, cache memory usage, cache flushing, and Bloom filter reconstruction.


show ddp mds_info domain_id=? controller=?





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.

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".


Developer view

Usage Guidelines

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


To display the mds information about the domain "0".

developer:/>show ddp mds_info domain_id=0 controller=0A
Fingerprint Cache : 32113212/47229658
Chunk cache : 0/0
Operations Cache : 11/248366
Bloom Filter : 14868080/15116446
LRU Cache : 9/248355
Disk : 34306/248346
Fingerprint Memory : 0KB/524288KB
Index Memory : 17408KB/9682944KB
Bloom Filter Memory : 17408KB
Operations Memory : 0KB
LRU Memory : 0KB
Operations Flush Item : 0
Operations Flush Count : 0
Operations Multiple Flush Count : 0
Bloom Filter Reconstruct Number : 1024
Bloom Filter ReadBtree Number : 73373
Bloom Filter Reconstructing Number : 0
Bloom Filter Reconstruct Flag : 1

System Response

The following table describes the parameter meanings.



Fingerprint Cache

Fingerprint cache hit count/Fingerprint cache query count.

Chunk cache

Chunk cache hit count/Chunk cache query count.

Operations Cache

Operations cache hit count/Operations cache query count.

Bloom Filter

Bloom filter cache judge new count/Bloom filter cache query count.

LRU Cache

LRU cache hit count/LRU cache query count.


Disk hit count/Disk query count.

Fingerprint Memory

Memory used by fingerprint/Maximum fingerprint memory.

Index Memory

Memory used by Index/Maximum Index memory.

Bloom Filter Memory

Memory used by Bloom Filter.

Operations Memory

Memory used by Operations.

LRU Memory

Memory used by LRU.

Operations Flush Item

Operations flush item count.

Operations Flush Count

Operations flush count.

Operations Multiple Flush Count

Operations cyclic flush count.

Bloom Filter Reconstruct Number

Bloom filter reconstruction count.

Bloom Filter ReadBtree Number

Bloom filter disk read count.

Bloom Filter Reconstructing Number

Number of bloom filter buckets under reconstruction in this domain.

Bloom Filter Reconstruct Flag

Bloom filter reconstructing flag.

Updated: 2020-01-17

Document ID: EDOC1000181575

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