We had a the following issue cause an outage for our exchange cluster
Event ID 1230
Cluster resource '<Cname>' (resource type '', DLL 'clusres.dll') either crashed or deadlocked. The Resource Hosting Subsystem (RHS) process will now attempt to terminate, and the resource will be marked to run in a separate monitor.
Event ID 1146
The cluster resource host subsystem (RHS) stopped unexpectedly. An attempt will be made to restart it. This is usually due to a problem in a resource DLL. Please determine which resource DLL is causing the issue and report the problem to the resource vendor.
This was on the Active node and actually caused an outage that lasted till we rebooted both systems.
I've gone through our logs and there are no indications of what caused this issue. and I'm getting pressed to provide a root cause.