Question

What is the recommended scan method for native deduplication enabled volume

  • 14 December 2022
  • 2 replies
  • 166 views

Userlevel 2
Badge +2

An year back, when we started to roll out Windows File servers (large numbers of file & folders) with native deduplication enabled, a lot of study was done to analyze the most compatible scan & we started using the “optimized scan” as the best method

 

However, since we upgraded the Clients to SP11.25.xx we started to see the below alert on the successfully completed backups. Going through the log files, the optimized scan is auto changed by Commvault to recursive scan. 

“Some Scan content is part of NTFS Deduplicated volume<br>Source: xxxxxx, Process: JobManager”

 

Would like to learn the best recommended scan method that supports Windows native deduplication enabled volumes. This is to ensure we have scan phase complete faster, no unmodified files are backed up. 


2 replies

Userlevel 7
Badge +23

Hi @wstbackup !  Thanks for the post.

This message is informational only. It's saying that it will use recursive method during the scan phase as opposed to either scan that uses change journal.

Are you seeing files not getting scanned/backed up, or just curious about the message?

Userlevel 1
Badge +5

Hi,

The below mentioned additional settings should help out in the process of recursive scan.

https://documentation.commvault.com/additionalsetting/details?name=%22MTScanThreads%22&id=2484

https://documentation.commvault.com/additionalsetting/details?name=%22mszScanErrorHandling%22&id=6587

https://documentation.commvault.com/additionalsetting/details?name=%22nGpfsTimeout%22&id=2368

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