General Parallel File System (GPFS) is a distributed filesystem, developed and owned by IBM. This is a proprietary and closed source storage system, which makes it less attractive and difficult to adapt. The licensing and support cost after storage hardware makes it very expensive. Moreover, it has a very limited set of storage interfaces; it provides neither block storage nor RESTful access to the storage system, so this is very restrictive deal. Even the maximum data replication is limited to only three copies, which reduces system reliability in the event of more than one simultaneous failure.