FATAL [fe3df] {startup} unable to initialize RocksDB engine: IO error: While lock file: /var/lib/arangodb3/engine-rocksdb/LOCK: Resource temporarily unavailable; Maybe your filesystem doesn't provide required features? (Cifs? NFS?)
I was trying to setup an arangodb cluster consisted of three node and the above error occurred when I typed "arangod" at my Centos terminal.