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DDB marked full by horizontal scaling

  • July 26, 2025
  • 2 replies
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Horizontal scaling Query

If a DDB is marked full because a certain threshold is met, a new DDB is scaled out.

The newly scaled out DDB will be use only by new subclients.  So am I right in the assumption that the DDB which was marked full will still be use by the existing subclients and the existing subclients will potentially continue to add more primary records in the DDB.  Thereby potentially increasing QI time on the DDB as more primary blocks are added?
 

2 replies

CV_GK
Vaulter
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  • Vaulter
  • July 26, 2025

Damian Andre
Vaulter
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You are right - when certain thresholds are met, existing DDBs will no longer accept new subclients. The primary record count without adding new subclients will steadily increase, but not as much as when adding new workloads. 

 

When the average number of primary records available on a DDB partition disk reaches the threshold of 800 million, the software creates a new DDB.

 

At 800 mil, there is still plenty of headroom for existing content to grow. If the existing DDB is slowing down you can manually move clients to a new DDB:

https://documentation.commvault.com/2023e/expert/moving_clients_from_full_deduplication_database_to_new_deduplication_database.html