Home > Storage > Unity XT > Virtualization, Cloud & Applications > Dell Unity XT: Microsoft SQL Server Best Practices > Advanced Deduplication
In addition to data reduction, the Advanced Deduplication feature can be enabled if data reduction is enabled. Advanced Deduplication reduces the amount of storage needed for user data by keeping only a few copies (often one copy) of a data block with a given content. The deduplication scope is a single LUN or file system, so keep this in mind when choosing the storage layout of the database. Fewer LUNs will result in better deduplication, but more LUNs are needed for maximum performance.