Sometimes it can be useful to share a single block device (e.g., HDD or SSD) between multiple nodes (e.g., Linux OSes) with a coherent file system. So that modifications to files on the shared block device by one node are visible to another node. Such file system is called a clustered file system. The difference with a distributed file system is that all the data lies into the single block device, whereas in a distributed file system data is distributed…