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Here's how I understand it.
A distributed lock manager (DLM) of some sorts is needed for controlling read/write access to a file or volume when multiple servers are I/O'ing it.
All these servers need to "participate" in the DLM to make this happen.
For OCFS for example, the O2CB cluster service is an integral part in managing shared access to the mounted OCFS file systems. A server cannot mount and use such a file system, without participating in the O2CB interconnect that exists for managing access to these OCFS file systems.
Likewise with ACFS. In this case, the CRS/Grid Interconnect is an integral part of managing shared access. A server that is not part of the Grid, cannot use and consume Grid resources - like an ACFS file system.
thanks for your answer. My thoughts were exactly the same. I missed something like the O2CB.
Thank you and have a nice day :-)
Billy is correct - the DLM requires that the nodes be part of the Grid cluster. You may wish to explore NFS or CIFS export to the 3rd node.
or redo the RAC-One node and make it a part of the RAC cluster.