NTSTATUS 0xC05CFF04: meaning and diagnosis

Status / error code:

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Constant name:

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Operating System:

Description:

the shared disk reservation was released; ownership must be re-evaluated.

Could be also:
Constant	Type	OS
ERROR_SVHDX_UNIT_ATTENTION_RESERVATIONS_RELEASED	HRESULT	Windows

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STATUS_SVHDX_UNIT_ATTENTION_RESERVATIONS_PREEMPTED	STATUS_SVHDX_UNIT_ATTENTION_REGISTRATIONS_PREEMPTED

STATUS_SVHDX_UNIT_ATTENTION_RESERVATIONS_RELEASED

The reservation state changed by release rather than normal I/O

STATUS_SVHDX_UNIT_ATTENTION_RESERVATIONS_RELEASED signals that a persistent reservation visible to this initiator was released. Release can be deliberate during controlled handoff, but the status still invalidates any assumption that the former holder can continue protected access.

Differentiate a release from preemption. A release describes reservation state being removed; preemption additionally involves another initiator taking or changing control. Both require the guest cluster to reconcile ownership before write traffic resumes.

What to verify

Verify whether the release corresponds to a planned shutdown, maintenance action, or failover workflow.
Re-read reservation state instead of relying on a prior local cache.
Keep the distinction from registration loss: a node can retain or lose registrations independently of the active reservation.

References

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