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Take a closer look at how storage is evolving in Windows Server, from NVMe improvements to high‑level platform investments. Dive into the details of native NVMe support, NVMe‑OF direction, ReFS enhan...
Pearl-Angeles
Updated May 15, 2026
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jpeg
Copper Contributor
May 13, 2026

Will REFS be updated to support SAN based CSVs?  Currently when using ReFS on SAN-based CSVs, the volume operates in File System Redirected Mode, meaning all I/O passes through the coordinator node over SMB rather than direct block-level access. This can cause severe performance degradation compared to NTFS, which supports Direct I/O in SAN environments.

  • Christina_Curlette's avatar
    Christina_Curlette
    Icon for Microsoft rankMicrosoft
    May 13, 2026

    Thank you for sharing this feedback. We are aware of this limitation and are investigating solutions to this for Windows Server vNext.