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STATUS_SVHDX_UNIT_ATTENTION_OPERATING_DEFINITION_CHANGED
The shared device changed a property relevant to operation
STATUS_SVHDX_UNIT_ATTENTION_OPERATING_DEFINITION_CHANGED reports that the storage device changed its operating definition. The condition is intentionally broader than a capacity change: it tells the initiator that cached assumptions about how the device should be addressed or operated may no longer be valid.
Investigate the event that changed storage state, such as a host-side configuration change, protocol renegotiation, or coordinated maintenance action. Retrying an old command against a stale model can create a secondary error that conceals the original state transition.
What to verify
- Obtain detailed sense information and record the device and initiator state before retrying.
- Refresh the attributes that the guest cluster or storage driver caches for this shared disk.
- Correlate host maintenance, VM migration, and storage events with the notification time.
References
- Microsoft: VHD Set files for guest clusters
- Microsoft: RawSCSIVirtualDisk
- T10: SCSI unit-attention condition handling
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