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The volumes in question are probably RWX in order to support live migration from one node to another. There is a brief interval where the volume needs to be attached both places for the handoff. However, that does not necessarily imply NFS. A simple

kubectl get volume <mumble> -n longhorn-system -o yaml

can answer that question. A volume that can migrate that way will have in its spec "migratable: true". Only if both "accessmode: rwx" and "migratable: false" is it going to use an NFS mount for true multi-writer function.

Ah!! THank you!