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VDS_E_FAILED_TO_ONLINE_DISK
VDS_E_FAILED_TO_ONLINE_DISK means IVdsDiskOnline::Online did not make the disk available. Causes can include SAN policy, read-only or invalid state, provider failure, device I/O problems or unresolved ownership conditions.
Capture the state that blocked Online
- Read disk status, flags and offline reason after the failed call.
- Check whether the disk must first have the read-only flag cleared.
- Inspect provider and system event logs, then refresh VDS before another attempt.
Do not repeatedly force online a disk that may be intentionally offline because of SAN policy or cluster ownership. For dynamic disks, the order of clearing read-only and bringing online matters. Verify that the selected disk is the intended target and that making it online will not create duplicate signatures or concurrent access to shared storage.
Online · Disk flags · Disk properties
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