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VDS_E_SHRINK_LUN_NOT_UNMASKED
VDS_E_SHRINK_LUN_NOT_UNMASKED means the selected LUN is not in the unmasking list for the local computer. VDS needs local host access so it can coordinate the Windows disk, partition and filesystem with the array-side capacity reduction.
Grant access only to the intended host
- Read the LUN unmasking list and identify the local server entry.
- Verify target login and path visibility after changing masking.
- Refresh VDS and match the newly surfaced disk to the LUN identification data.
Do not shrink the LUN out-of-band while it is hidden from the host that owns the filesystem. Also avoid broad unmasking to every server; LUN masking is an access-control boundary. Add the narrow required mapping, perform and verify the operation, then restore policy if temporary access was intended.
SetMask · LUN properties · iSCSI protocol
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