Its Because of this Disk change where UUID of this TS was different but after change of WAL it created new one hence you seeing the wrong_server_UUID , simple restart of this TS will fix the issue in most of cases if not then please rebuild this TS from scratch while deleting the data and wal dir of this one it will solve the issue Note: Only proceed with rebuild if you have RF=3 in the cluster otherwise it will be a dataloss scenario ... View more