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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 .
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.
As the FSF (Free Software Foundation) claimed that there was a legal incompatibility between the CDDL and the GPL in 2005, Sun's implementation of the ZFS file system couldn't be used as a basis for the development of a module in the Linux kernel, couldn't be merged into the mainline Linux kernel, and Linux distributions generally did not include it as a precompiled kernel module.
No redundancy [19] [20] 2003 MinIO: Go AGPL3.0 AWS S3 API, FTP, SFTP: Yes Yes Reed-Solomon [21] Object [22] 2014 MooseFS: C GPLv2 POSIX, FUSE: master No Replication [23] File [24] 2008 OpenAFS: C IBM Public License Virtual file system, Installable File System: Replication Volume [25] 2000 [26] OpenIO [27] C AGPLv3 / LGPLv3
The ZFS filesystem can likewise pool multiple devices of different sizes and implement RAID, though it is less flexible, requiring the creation of virtual devices of fixed size on each device before pooling. [11] In enterprise environments, enclosures are used to expand a server's data storage by using JBOD [12] devices. This is often a ...
The Friedmann equations start with the simplifying assumption that the universe is spatially homogeneous and isotropic, that is, the cosmological principle; empirically, this is justified on scales larger than the order of 100 Mpc.