Design a Distributed File System

Develop a file system that manages files across multiple machines, providing users and applications with concurrent access to data stored on a network of servers. This system should ensure data integrity, reliability, and high availability, supporting features like replication, fault tolerance, and distributed locking. The design must accommodate large data volumes, provide mechanisms for efficient data distribution and retrieval, and maintain performance and scalability as the system grows. Examples include, Goolge filesystem, Hadoop Distributed File System (HDFS), Amazon S3 and Microsoft Azure Blob Storage.