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OpenZFS is mainly used in enterprise and data center environments, as well as consumer devices like network-attached storage (NAS) devices, where data reliability and safety is essential. While initially designed for Solaris, development has since focused on Linux , while ports exist for various BSD distributions and macOS .
ZFS (previously Zettabyte File System) is a file system with volume management capabilities. It began as part of the Sun Microsystems Solaris operating system in 2001. Large parts of Solaris, including ZFS, were published under an open source license as OpenSolaris for around 5 years from 2005 before being placed under a closed source license when Oracle Corporation acquired Sun in 2009–2010.
After Oracle's Solaris 11 Express release, the OS/Net consolidation (the main OS code) was made proprietary and closed-source, [3] and further ZFS upgrades and implementations inside Solaris (such as encryption) are not compatible with other non-proprietary implementations which use previous versions of ZFS.
TrueNAS (formerly FreeNAS) is a family of network-attached storage (NAS) products produced by iXsystems, incorporating both open-source and commercial software. Based on the OpenZFS file system, TrueNAS runs on FreeBSD as well as Linux and is available under the BSD License.
OpenZFS, an open-source derivative of Oracle ZFS; Other uses. Zurich Financial Services; Zero field splitting, a spectroscopic concept
z/OS File System (zFS) (official name: z/OS® Distributed File Service zSeries® File System) is a POSIX-style hierarchical file system for IBM's z/OS operating system for z System mainframes, a successor to that operating system's HFS.
Before that, OpenZFS was mostly about the project. （3） In my opinion ZFS now mostly refers to OpenZFS, as Oracle ZFS is only supported on Solaris, a platform discontinued in 2017. People are using OpenZFS on Linux, FreeBSD and other platforms, not the Oracle one. Tomskyhaha 22:42, 19 May 2020 (UTC)
In OpenZFS, disk reads often hit the first level disk cache in RAM using ARC. If a SSD is set up to store the second level disk cache, it is called an L2ARC. L2ARC uses the same ARC algorithm, but instead of storing the cached data in RAM, L2ARC stores the cached data in a fast SSD.