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STATUS_SVHDX_UNIT_ATTENTION_CAPACITY_DATA_CHANGED
Cached capacity information is no longer valid
STATUS_SVHDX_UNIT_ATTENTION_CAPACITY_DATA_CHANGED says that the device capacity seen by this initiator changed. This is more specific than a generic Unit Attention: calculations based on old logical-block bounds, partition limits, or volume size must not continue until the guest and clustering layers have refreshed their view.
A shared virtual disk can be resized through supported management paths. After such a change, capacity discovery and any dependent partition or file-system extension are separate operations that must be coordinated with the guest cluster; a changed backing file does not automatically make every node safe to continue with cached geometry.
What to verify
- Read capacity again and compare old and new values before allocating blocks or extending a volume.
- Record which host-side resize or storage event preceded the notification.
- Ensure cluster-wide ownership and application coordination before changing partitions or file systems.
References
- Microsoft: VHD Set files for guest clusters
- Microsoft: RawSCSIVirtualDisk
- T10: SCSI unit-attention condition handling
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