Q: Can I use ReFS for my SQL Server database storage?

A. There are some features of NTFS that aren't supported by ReFS, specifically named streams, object IDs, short names, compression, file-level encryption (EFS), user data transactions, sparse, hard-links, extended attributes, and quotas. SQL Server databases uses named streams and sparse files in several functions, for example DBCC CHECKDB. This means you should not use ReFS with SQL Server. Stick with NTFS.