NetWorker: How to read Data Domain statistics for a NetWorker save set

Summary: Use mminfo to extract deduplication statistics for a NetWorker save set on a Data Domain; the output follows version:cloneid:backup:pre‑compression:post‑compression and shows deduplicate compression process. ...

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Instructions

The NetWorker media database stores the metadata for a NetWorker save set. This metadata includes the deduplication (dedupe) statistics for the save sets written to Data Domain devices.

There are two ways to display detailed deduplication statistics for a save set from the NetWorker media database:

mminfo -q ssid=save-set-id -S
This shows the save set's metadata statistics.
Or
mminfo -q ssid=save-set-id -r attrs
This shows the save set's deduplication (dedupe) details; other columns can be added as needed.


How to read the Data Domain dedup statistics: 

<version>:<cloneid>:<backup size>:<pre local compression size>:<post local compression size>


For Example:

On the NetWorker server: 

# mminfo -q "ssid=3190711499" -r "ssid,sumsize,totalsize"
ssid         size      total
3190711499   49 MB   50655224
 
# mminfo -q "ssid=3190711499" -S
ssid=3190711499 savetime=10/03/2014 10:02:55 AM (1412326975) vm-lego-231:/etc
 
*ss data domain backup cloneid: 1412326975;
*ss data domain dedup statistics: "v1:1412326975:50823364:1625378:738007";

On the Data Domain:

# filesys show compression "/data/col1/vm-lego-121/onetwoone/82/42/f7e023b6-00000006-be2e64cb-542e64cb-00435000-637ca656"
Total files: 1;  bytes/storage_used: 68.3
 Original Bytes:                 50,824,052              - raw bytes
 Globally Compressed:            1,626,066               - pre_lc_size
 Locally Compressed:             738,201                 - post_lc_size
 Meta-data:                      5,528

For this save set:

cloneid                          :  1412326975
backup size                      :   50823364
pre local-compression size       :   1625378
post local-compression size      :   738007


The Data Domain performs inline deduplication which accounts for the difference between the initial backup size and the 'pre local-compression size' also known as the 'Globally Compressed' size. This deduped data is then compressed.

For a complete explanation of this process, refer to the following article: Data Domain: Understanding Data Domain Compression

Affected Products

Data Domain, NetWorker

Products

NetWorker Family
Article Properties
Article Number: 000023290
Article Type: How To
Last Modified: 24 آذار 2026
Version:  4
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