What are the benefits to enabling the horizontal DDB, BOL explains how enable this feature, but nothing about the real benefits except that split the DDB in 3 section first for File system, another for Database and the last one for VM.
Can I expect to see an improvement in backup performance or an increase in deduplication performance that would further reduce on-disk consumption?
Horizontal scaling improves deduplication efficiency because similar data types deduplicate more efficiently than dissimilar data types.
Also, the Commvault software automatically creates a new deduplication database when either the free space on a deduplication database partition disk reaches the threshold or the query and insertion (QI) time exceeds the threshold.
For more information, please review the following URL: