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ZFS runs on Solaris, FreeBSD and Linux variants, and includes built-in data services and features such as replication, deduplication, compression, snapshots and data protection. The Sun development team began work on ZFS in 2001 and integrated it into the Unix-based Solaris and open source OpenSolaris operating systems in 2005.
After acquiring Sun in 2010, Oracle Corp. discontinued work on open source ZFS. The company trademarked the name "ZFS" and turned ZFS into its proprietary root file system for Oracle Solaris, Oracle's ZFS Storage Appliances, mainframe storage (VSM) and other Oracle technologies. Oracle continues to develop and add features to its proprietary ZFS. The open source version of ZFS is now known as OpenZFS.
ZFS originally stood for Zettabyte File System. The word zettabyte no longer carries significance in the context of the file system, since ZFS is able to scale beyond 1 zettabyte.