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ERROR_CLUSTER_PROPERTY_DATA_TYPE_MISMATCH
Cluster properties are typed records, not unstructured name-value pairs
ERROR_CLUSTER_PROPERTY_DATA_TYPE_MISMATCH means the property name was recognized, but its encoded value type did not match the type required by the cluster object or resource DLL. Cluster property lists carry a CLUSPROP_SYNTAX descriptor with each value, so a DWORD, Unicode string, multi-string, binary blob, and expanded string are not interchangeable even when their textual representation looks plausible.
Inspect the exact input buffer before changing the resource. Confirm the property is common, private, or read-only; compare its documented format with the syntax field; and preserve list terminators and byte counts. PowerShell can hide this encoding layer, so reproduce through Get-ClusterParameter and the resource type documentation rather than converting every value to a string. A restart cannot repair a structurally incorrect property list.
Evidence to capture from the failed property update
- Property name, resource type, and whether the property is common or private.
- CLUSPROP type, format, and buffer length supplied to the control code.
- Current value and data type returned by the cluster before the change.
- Resource DLL validation result, not only the outer management-tool exception.
References
- Microsoft: CLUSPROP syntax and property-list encoding
- Microsoft: validation of private resource properties
- Microsoft: retrieving typed private property lists
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