Editing Consistency model (section)

===== Quorum-based protocols =====

Voting can be another approach in replicated-write protocols. In this approach, a client requests and receives permission from multiple servers in order to read and write a replicated data. As an example, suppose in a distributed file system, a file  is replicated on N servers. To update a file, a client must send a request to at least {{nowrap|N/2 + 1}} in order to make their agreement to perform an update. After the agreement, changes are applied on the file and a new version number is assigned to the updated file. Similarly, for reading replicated file, a client sends a request to {{nowrap|N/2 + 1}} servers in order to receive the associated version number from those servers. Read operation is completed if all received version numbers are the most recent version.<ref name="Replica"/>