NFS 3 locking on ESXi does not use the Network Lock Manager (NLM) protocol. Instead, VMware does provide it's own locking protocol. NFS 3 locks are implemented by creating lock files on the NFS server. Lock files are named .lck-file_id.
NFS 4.1 uses share reservations as a locking mechanism.
File locking mechanisms are used to restrict access to data to only one user or process at a time. NFS 3 and NFS 4.1 file locking mechanisms are incompatible with each other.
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