Proxmox is a cluster-based hypervisor. It is meant to be used with several server nodes. By using multiple nodes in a cluster, we provide redundancy or High Availability to the platform while increasing uptime. A production virtual environment may have several dozens to several hundreds of nodes in a cluster. As an administrator, it may not be a realistic scenario to change configuration files in the cluster one node at a time. Depending on the number of nodes in a cluster, it may take several hours just to change one small argument in a configuration file of all the nodes. An administrator would have to go from node to node to apply these changes. To alleviate wastage of precious time, Proxmox implemented the clustered filesystem to keep all the configuration files, or any other common files shared by all the nodes in the cluster, in a synchronous state. Its official name is Proxmox Cluster file system or pmxcfs, which is a database-driven filesystem...