Article ID: 3565
Last updated: 08 Jul, 2025
Difference in the occupied space between the Windows client and storage hostThe discrepancy between Windows and Open-E JovianDSS storage host in the occupied space on zvol is a result of the lack of support for TRIM on ReFS on iSCSI/SAN disks on Windows Server, which is confirmed by Microsoft and independent documentation (listed below). To avoid this issue, NTFS should be used. The TRIM/UNMAP mechanism on remote block disks is supported natively since Windows Server 2012, but only in combination with the NTFS file system or as part of Storage Spaces - ReFS in the Windows Server 2016/2019/2022 releases skips these commands. Links to official and external documentation:
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