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ERROR_RESMON_ONLINE_FAILED
The resource failed during its Online operation
This code places the failure in the resource activation path. Resource DLL entry points let the Cluster service request Online processing through Resource Monitor. The resource may validate properties, open devices, start a service, bind an address, or perform vendor-specific work before reporting Online.
The cluster error is only the outer result. The decisive evidence is usually in the resource-specific events and the Cluster.log sequence around the Online call. Dependencies can already be online while the resource itself rejects configuration or cannot initialize its workload.
What to inspect
- Find the first resource-specific error immediately before the cluster reports the online failure.
- Inspect private resource parameters and external prerequisites such as service credentials, paths, addresses, storage, or installed components.
- Do not increase restart thresholds or failover counts until the underlying Online failure is understood; that only repeats the failing entry point.
Get-ClusterResource -Name <ResourceName> | Format-List Name, State, ResourceType, OwnerGroup
Get-ClusterParameter -InputObject (Get-ClusterResource -Name <ResourceName>)References
- Microsoft: Resource DLL entry-point functions
- Microsoft: Resource Failure
- Microsoft: Get-ClusterParameter
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