Performance

For performance-demanding environments, such as virtualization scenarios, ReFS offers several advantages, such as Mirror-Accelerated Parity, a technology that brings mirroring and parity to Storage Spaces Direct and offers fast write performance paired with efficient fault-tolerance. 

Block-cloning enables the operating system to perform fast and efficient copy operations, while integrity streams in ReFS maintain the data integrity and performs the validation using checksums, checking whether the data is corrupt, and performing the repairs accordingly.

NTFS is widely used as an all-purpose filesystem, while ReFS is used in specific workloads and scenarios where increased availability, scalability, and resilience is required.

Storage Spaces and Storage Spaces Direct take advantage of ReFS to achieve high-performance, mirror-accelerated storage, block cloning, and sparse VDL functionalities, which dramatically increase virtual hard disk (VHD) operations; alternate data copies, online corruption repair and integrity streams deal with data corruption.

The following table lists the feature or functional differences between NTFS and ReFS:

Feature or functionality NTFS ReFS
Offloaded Data Transfer (ODX) Yes No
Block clone No Yes
Sparse VDL No Yes
Mirror-accelerated Parity No Yes
File system compression Yes No
File system encryption Yes No
Transactions Yes No
Hard Links Yes No
Object IDs Yes No
Short names Yes No
Extended attributes Yes No
Disk quotas Yes No
Bootable Yes No
Page file support Yes No
Removable media support Yes No
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